diff --git a/app/Http/Controllers/Auth/InstagramController.php b/app/Http/Controllers/Auth/InstagramController.php
index c9a45bf253..f736e11bd7 100644
--- a/app/Http/Controllers/Auth/InstagramController.php
+++ b/app/Http/Controllers/Auth/InstagramController.php
@@ -24,6 +24,8 @@ class InstagramController extends SocialController
         'instagram_business_basic',
         'instagram_business_content_publish',
         'instagram_business_manage_insights',
+        // first comment after publish (FirstCommentPoster)
+        'instagram_business_manage_comments',
     ];
 
     public function connect(Request $request): Response
diff --git a/app/Http/Controllers/Auth/InstagramFacebookController.php b/app/Http/Controllers/Auth/InstagramFacebookController.php
index 4a8a4262a2..928afdb90f 100644
--- a/app/Http/Controllers/Auth/InstagramFacebookController.php
+++ b/app/Http/Controllers/Auth/InstagramFacebookController.php
@@ -46,6 +46,8 @@ class InstagramFacebookController extends MetaController
         'instagram_basic',
         'instagram_content_publish',
         'instagram_manage_insights',
+        // first comment after publish (FirstCommentPoster)
+        'instagram_manage_comments',
     ];
 
     public function connect(Request $request): Response
diff --git a/app/Jobs/PublishToSocialPlatform.php b/app/Jobs/PublishToSocialPlatform.php
index 7d98c7da8e..2f50763114 100644
--- a/app/Jobs/PublishToSocialPlatform.php
+++ b/app/Jobs/PublishToSocialPlatform.php
@@ -30,6 +30,7 @@
 use App\Services\Social\Telegram\TelegramPublisher;
 use App\Services\Social\ThreadsPublisher;
 use App\Services\Social\TikTokPublisher;
+use App\Services\Social\FirstCommentPoster;
 use App\Services\Social\XPublisher;
 use App\Services\Social\YouTubePublisher;
 use App\Support\Social\GoogleBusinessDerivativeCleaner;
@@ -130,6 +131,15 @@ public function handle(): void
                 $result = $publisher->publish($this->post);
 
                 $this->recordPublishResult($result);
+
+                // The post is live; a failed first comment must never fail it —
+                // FirstCommentPoster logs and swallows its own errors. Posts
+                // held in pending review (Google Business) get no comment.
+                if ($this->post->publish_status === PublishStatus::Published
+                    && ($externalId = (string) data_get($result, 'id')) !== '') {
+                    app(FirstCommentPoster::class)->post($this->post, $externalId);
+                }
+
                 break;
             } catch (PlatformUnavailableException $e) {
                 $this->rescheduleForRetry($e);
diff --git a/app/Services/Social/FirstCommentPoster.php b/app/Services/Social/FirstCommentPoster.php
new file mode 100644
index 0000000000..39f9a3771f
--- /dev/null
+++ b/app/Services/Social/FirstCommentPoster.php
@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Social;
+
+use App\Enums\SocialAccount\Platform;
+use App\Models\Post;
+use App\Services\Social\Concerns\HasSocialHttpClient;
+use Illuminate\Support\Facades\Log;
+
+/**
+ * Posts the per-platform `meta.first_comment` under a just-published post.
+ * The classic "link in the first comment" move: YouTube descriptions bury
+ * links below the fold and Instagram captions don't render them at all.
+ *
+ * Runs after the post is already live, so it must never fail the publish —
+ * every failure is logged and swallowed.
+ */
+class FirstCommentPoster
+{
+    use HasSocialHttpClient;
+
+    public function post(Post $post, string $externalId): void
+    {
+        $comment = trim((string) data_get($post->meta, 'first_comment'));
+
+        if ($comment === '') {
+            return;
+        }
+
+        try {
+            match ($post->platform) {
+                Platform::YouTube => $this->postYouTubeComment($post, $externalId, $comment),
+                Platform::Instagram, Platform::InstagramFacebook => $this->postInstagramComment($post, $externalId, $comment),
+                default => Log::warning('First comment is not supported for this platform', [
+                    'platform' => $post->platform->value,
+                    'post_id' => $post->id,
+                ]),
+            };
+        } catch (\Throwable $e) {
+            Log::warning('First comment failed (post itself is published)', [
+                'platform' => $post->platform->value,
+                'post_id' => $post->id,
+                'error' => $e->getMessage(),
+            ]);
+        }
+    }
+
+    /**
+     * commentThreads.insert needs the youtube.force-ssl scope — requested at
+     * connect time since the platform was added, so every account has it.
+     */
+    private function postYouTubeComment(Post $post, string $videoId, string $comment): void
+    {
+        $account = $post->socialAccount;
+        $api = rtrim((string) config('trypost.platforms.youtube.data_api'), '/');
+
+        $response = $this->socialHttp()
+            ->withToken($account->access_token)
+            ->post("{$api}/commentThreads?part=snippet", [
+                'snippet' => [
+                    'videoId' => $videoId,
+                    'topLevelComment' => [
+                        'snippet' => ['textOriginal' => $comment],
+                    ],
+                ],
+            ]);
+
+        if ($response->failed()) {
+            Log::warning('YouTube first comment failed', [
+                'post_id' => $post->id,
+                'status' => $response->status(),
+                'body' => $this->redactResponseBody($response->body()),
+            ]);
+        }
+    }
+
+    /**
+     * Needs instagram_business_manage_comments (direct) / instagram_manage_comments
+     * (via Facebook Page) — accounts connected before the scope was requested
+     * get a 4xx here, which is logged and ignored; reconnecting fixes it.
+     */
+    private function postInstagramComment(Post $post, string $mediaId, string $comment): void
+    {
+        $account = $post->socialAccount;
+        $baseUrl = $account->platform->instagramGraphBaseUrl();
+
+        $response = $this->socialHttp()->post("{$baseUrl}/{$mediaId}/comments", [
+            'message' => $comment,
+            'access_token' => $account->access_token,
+        ]);
+
+        if ($response->failed()) {
+            Log::warning('Instagram first comment failed', [
+                'post_id' => $post->id,
+                'status' => $response->status(),
+                'body' => $this->redactResponseBody($response->body()),
+            ]);
+        }
+    }
+}
diff --git a/app/Support/PostPlatformMetaRules.php b/app/Support/PostPlatformMetaRules.php
index 63ebdb0a21..5a1980fe27 100644
--- a/app/Support/PostPlatformMetaRules.php
+++ b/app/Support/PostPlatformMetaRules.php
@@ -103,6 +103,11 @@ public static function rules(string $prefix = 'meta'): array
             "{$prefix}.brand_content_toggle" => ['sometimes', 'boolean'],
             "{$prefix}.brand_organic_toggle" => ['sometimes', 'boolean'],
 
+            // First comment posted right after a successful publish (YouTube and
+            // Instagram). Capped at Instagram's comment limit, the stricter of
+            // the two.
+            "{$prefix}.first_comment" => ['sometimes', 'nullable', 'string', 'max:2200'],
+
             "{$prefix}.board_id" => ['sometimes', 'nullable', 'string'],
             "{$prefix}.title" => ['sometimes', 'nullable', 'string', 'max:100'],
             "{$prefix}.link" => ['sometimes', 'nullable', 'url:http,https', 'max:2048'],
@@ -185,6 +190,7 @@ public static function messages(string $prefix = 'meta'): array
             "{$prefix}.collaborators.*.regex" => __('posts.form.instagram.collaborators.invalid'),
             "{$prefix}.event.end_date.after_or_equal" => __('posts.form.google_business.event_end_date_before_start'),
             "{$prefix}.event.title.max" => __('posts.form.google_business.title_max'),
+            "{$prefix}.first_comment.max" => __('posts.form.first_comment.max'),
         ];
     }
 
@@ -201,6 +207,7 @@ public static function attributes(string $prefix = 'meta'): array
             "{$prefix}.link" => __('posts.form.pinterest.link'),
             "{$prefix}.event.title" => __('posts.form.google_business.event_title'),
             "{$prefix}.call_to_action.url" => __('posts.form.google_business.cta_url'),
+            "{$prefix}.first_comment" => __('posts.form.first_comment.label'),
         ];
     }
 
@@ -223,6 +230,7 @@ public static function documentation(): string
             'Facebook, Bluesky, LinkedIn: link_preview (default true; false publishes a text post with a link without its preview card).',
             'LinkedIn (profile and page): document_title (≤300, the title shown on a PDF document post; defaults to the file name).',
             'Google Business Profile: topic_type STANDARD (default)|EVENT|OFFER; call_to_action {action_type: '.implode('|', array_column(CtaAction::cases(), 'value')).', url} (not on OFFER; url required unless NONE or CALL); event {title ≤'.TopicType::TITLE_MAX_LENGTH.', start_date, end_date (YYYY-MM-DD), start_time, end_time (HH:MM)} (required on EVENT and OFFER, the title being the offer title); offer {coupon_code, redeem_online_url, terms_conditions ≤5000} (OFFER only).',
+            'YouTube Shorts and Instagram: first_comment (≤2200, posted by the account right after a successful publish).',
             'Telegram, Facebook reels and stories: no settings. Stories (Instagram and Facebook) publish no text.',
             'Threads of posts: thread_replies (list of up to '.ThreadReplies::MAX_REPLIES.' replies published under the post as a thread, each {text, media} where media is a list of up to 4 media items ({url}, {id} or {upload_token}, with optional meta.alt_text) for that reply alone; a plain string is a text-only reply) on Bluesky, Mastodon and X only; each reply needs text or media, its media follows the rules of a post on that network, and its text must fit the account limit (Bluesky 300, Mastodon 500 including the content warning, which every reply repeats, X 280 or 25000 for accounts with long posts).',
         ]);
diff --git a/lang/ar/posts.php b/lang/ar/posts.php
index c17e2c9ed7..3f243b28be 100644
--- a/lang/ar/posts.php
+++ b/lang/ar/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'السفر والفعاليات',
             ],
         ],
+        'first_comment' => [
+            'label' => 'التعليق الأول',
+            'placeholder' => 'رابط وإضافات للتعليق الأول…',
+            'hint' => 'يُنشر باسم قناتك فور نشر الفيديو.',
+            'hint_instagram' => 'يُنشر فور النشر — المكان الكلاسيكي للروابط التي لا تكون قابلة للنقر في وصف Instagram. أعد ربط الحساب مرة واحدة لمنح إذن التعليقات.',
+            'max' => 'لا يمكن أن يتجاوز التعليق الأول 2200 حرف.',
+        ],
         'ai_generated' => [
             'label' => 'بالذكاء الاصطناعي',
             'hint' => 'أخبر المشاهدين بأن المحتوى أُنشئ أو عُدّل بالذكاء الاصطناعي.',
diff --git a/lang/de/posts.php b/lang/de/posts.php
index e35f9df0c2..02bf5e91a4 100644
--- a/lang/de/posts.php
+++ b/lang/de/posts.php
@@ -448,6 +448,13 @@
                 'travel_and_events' => 'Reisen & Events',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Erster Kommentar',
+            'placeholder' => 'Link und Extras für den ersten Kommentar…',
+            'hint' => 'Wird direkt nach der Veröffentlichung vom Kanal gepostet.',
+            'hint_instagram' => 'Wird direkt nach dem Beitrag gepostet — der klassische Ort für Links, die in Instagram-Beschreibungen nicht klickbar sind. Konto einmal neu verbinden, um die Kommentar-Berechtigung zu erteilen.',
+            'max' => 'Der erste Kommentar darf 2200 Zeichen nicht überschreiten.',
+        ],
         'ai_generated' => [
             'label' => 'KI-generiert',
             'hint' => 'Zeige deinen Zuschauern, dass dein Inhalt mit KI erstellt oder bearbeitet wurde.',
diff --git a/lang/el/posts.php b/lang/el/posts.php
index 833fe88b1f..0a9f29f649 100644
--- a/lang/el/posts.php
+++ b/lang/el/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Ταξίδια και εκδηλώσεις',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Πρώτο σχόλιο',
+            'placeholder' => 'Σύνδεσμος και πρόσθετα για το πρώτο σχόλιο…',
+            'hint' => 'Δημοσιεύεται από το κανάλι σας αμέσως μετά τη δημοσίευση του βίντεο.',
+            'hint_instagram' => 'Δημοσιεύεται αμέσως μετά την ανάρτηση — το κλασικό σημείο για συνδέσμους που οι λεζάντες του Instagram δεν κάνουν κλικαρίσιμους. Επανασυνδέστε τον λογαριασμό μία φορά για να δώσετε το δικαίωμα σχολίων.',
+            'max' => 'Το πρώτο σχόλιο δεν μπορεί να υπερβαίνει τους 2200 χαρακτήρες.',
+        ],
         'ai_generated' => [
             'label' => 'Με AI',
             'hint' => 'Ενημερώστε τους θεατές ότι το περιεχόμενο δημιουργήθηκε ή επεξεργάστηκε με AI.',
diff --git a/lang/en/posts.php b/lang/en/posts.php
index 4b7f5a5b0b..cb7fb8e6f2 100644
--- a/lang/en/posts.php
+++ b/lang/en/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Travel & Events',
             ],
         ],
+        'first_comment' => [
+            'label' => 'First comment',
+            'placeholder' => 'Link and extras for the first comment…',
+            'hint' => 'Posted by your channel right after the video is published.',
+            'hint_instagram' => 'Posted right after publishing — the classic spot for links Instagram captions can\'t make clickable. Requires reconnecting the account once to grant the comments permission.',
+            'max' => 'First comment may not exceed 2200 characters.',
+        ],
         'ai_generated' => [
             'label' => 'AI-generated',
             'hint' => 'Tell viewers your content was generated or edited with AI.',
diff --git a/lang/es/posts.php b/lang/es/posts.php
index a2d229f477..57383dbea2 100644
--- a/lang/es/posts.php
+++ b/lang/es/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Viajes y eventos',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Primer comentario',
+            'placeholder' => 'Enlace y extras para el primer comentario…',
+            'hint' => 'Se publica desde tu canal justo después de publicar el vídeo.',
+            'hint_instagram' => 'Se publica justo después de la publicación: el lugar clásico para enlaces que Instagram no hace clicables en la descripción. Reconecta la cuenta una vez para conceder el permiso de comentarios.',
+            'max' => 'El primer comentario no puede superar los 2200 caracteres.',
+        ],
         'ai_generated' => [
             'label' => 'Generado con IA',
             'hint' => 'Indica a los espectadores que el contenido se creó o editó con IA.',
diff --git a/lang/fr/posts.php b/lang/fr/posts.php
index 882a779eaf..15eebb829f 100644
--- a/lang/fr/posts.php
+++ b/lang/fr/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Voyages et événements',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Premier commentaire',
+            'placeholder' => 'Lien et compléments pour le premier commentaire…',
+            'hint' => 'Publié par votre chaîne juste après la mise en ligne de la vidéo.',
+            'hint_instagram' => 'Publié juste après la publication — l\'endroit classique pour les liens que les légendes Instagram ne rendent pas cliquables. Reconnectez le compte une fois pour accorder l\'autorisation de commenter.',
+            'max' => 'Le premier commentaire ne peut pas dépasser 2200 caractères.',
+        ],
         'ai_generated' => [
             'label' => 'Généré par IA',
             'hint' => 'Indiquez aux spectateurs que le contenu a été généré ou modifié par IA.',
diff --git a/lang/it/posts.php b/lang/it/posts.php
index da11287724..9c9ea1c1c0 100644
--- a/lang/it/posts.php
+++ b/lang/it/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Viaggi ed eventi',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Primo commento',
+            'placeholder' => 'Link ed extra per il primo commento…',
+            'hint' => 'Pubblicato dal tuo canale subito dopo la pubblicazione del video.',
+            'hint_instagram' => 'Pubblicato subito dopo il post: il posto classico per i link che le didascalie di Instagram non rendono cliccabili. Ricollega l\'account una volta per concedere il permesso sui commenti.',
+            'max' => 'Il primo commento non può superare i 2200 caratteri.',
+        ],
         'ai_generated' => [
             'label' => 'Generato con IA',
             'hint' => 'Comunica agli spettatori che il contenuto è stato generato o modificato con l\'IA.',
diff --git a/lang/ja/posts.php b/lang/ja/posts.php
index 5ee94ab718..f51c1a1b75 100644
--- a/lang/ja/posts.php
+++ b/lang/ja/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => '旅行とイベント',
             ],
         ],
+        'first_comment' => [
+            'label' => '最初のコメント',
+            'placeholder' => '最初のコメントに入れるリンクや補足…',
+            'hint' => '動画公開直後にチャンネルから投稿されます。',
+            'hint_instagram' => '投稿直後にコメントされます。Instagramのキャプションでクリックできないリンクの定番の置き場所です。コメント権限を付与するには一度アカウントを再連携してください。',
+            'max' => '最初のコメントは2200文字を超えられません。',
+        ],
         'ai_generated' => [
             'label' => 'AI 生成',
             'hint' => 'コンテンツが AI で生成・編集されたことを視聴者に伝えます。',
diff --git a/lang/ko/posts.php b/lang/ko/posts.php
index 3c70e1d2c3..6a24e4142c 100644
--- a/lang/ko/posts.php
+++ b/lang/ko/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => '여행/이벤트',
             ],
         ],
+        'first_comment' => [
+            'label' => '첫 댓글',
+            'placeholder' => '첫 댓글에 넣을 링크와 추가 내용…',
+            'hint' => '동영상 게시 직후 채널 명의로 작성됩니다.',
+            'hint_instagram' => '게시 직후 작성됩니다 — Instagram 캡션에서 클릭되지 않는 링크를 넣는 고전적인 방법입니다. 댓글 권한을 부여하려면 계정을 한 번 다시 연결하세요.',
+            'max' => '첫 댓글은 2200자를 초과할 수 없습니다.',
+        ],
         'ai_generated' => [
             'label' => 'AI 생성',
             'hint' => '콘텐츠가 AI로 생성 또는 편집되었음을 시청자에게 알립니다.',
diff --git a/lang/nl/posts.php b/lang/nl/posts.php
index 835a33815c..674e650ff6 100644
--- a/lang/nl/posts.php
+++ b/lang/nl/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Reizen en evenementen',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Eerste reactie',
+            'placeholder' => 'Link en extra\'s voor de eerste reactie…',
+            'hint' => 'Direct na publicatie door je kanaal geplaatst.',
+            'hint_instagram' => 'Direct na het bericht geplaatst — dé plek voor links die Instagram-bijschriften niet klikbaar maken. Verbind het account één keer opnieuw om de reactietoestemming te geven.',
+            'max' => 'De eerste reactie mag niet langer zijn dan 2200 tekens.',
+        ],
         'ai_generated' => [
             'label' => 'AI-gegenereerd',
             'hint' => 'Laat kijkers weten dat je content met AI is gemaakt of bewerkt.',
diff --git a/lang/pl/posts.php b/lang/pl/posts.php
index eb01b782ac..cc8bc6a83e 100644
--- a/lang/pl/posts.php
+++ b/lang/pl/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Podróże i wydarzenia',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Pierwszy komentarz',
+            'placeholder' => 'Link i dodatki do pierwszego komentarza…',
+            'hint' => 'Publikowany przez Twój kanał zaraz po opublikowaniu filmu.',
+            'hint_instagram' => 'Publikowany zaraz po poście — klasyczne miejsce na linki, których opisy na Instagramie nie czynią klikalnymi. Połącz konto ponownie, aby nadać uprawnienie do komentarzy.',
+            'max' => 'Pierwszy komentarz nie może przekraczać 2200 znaków.',
+        ],
         'ai_generated' => [
             'label' => 'Treść AI',
             'hint' => 'Poinformuj widzów, że treść została wygenerowana lub edytowana przez AI.',
diff --git a/lang/pt-BR/posts.php b/lang/pt-BR/posts.php
index 65df7297d8..d88316da2b 100644
--- a/lang/pt-BR/posts.php
+++ b/lang/pt-BR/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Viagens e eventos',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Primeiro comentário',
+            'placeholder' => 'Link e extras para o primeiro comentário…',
+            'hint' => 'Publicado pelo seu canal logo após o vídeo ir ao ar.',
+            'hint_instagram' => 'Publicado logo após a postagem — o lugar clássico para links que as legendas do Instagram não tornam clicáveis. Reconecte a conta uma vez para conceder a permissão de comentários.',
+            'max' => 'O primeiro comentário não pode exceder 2200 caracteres.',
+        ],
         'ai_generated' => [
             'label' => 'Gerado por IA',
             'hint' => 'Avise aos espectadores que o conteúdo foi gerado ou editado com IA.',
diff --git a/lang/ru/posts.php b/lang/ru/posts.php
index 8f6df080e8..d8a5673520 100644
--- a/lang/ru/posts.php
+++ b/lang/ru/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Путешествия',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Первый комментарий',
+            'placeholder' => 'Ссылка и дополнения для первого комментария…',
+            'hint' => 'Публикуется от имени канала сразу после выхода ролика.',
+            'hint_instagram' => 'Публикуется сразу после поста — классическое место для ссылок, которые в описании Instagram некликабельны. Требуется один раз переподключить аккаунт, чтобы выдать право на комментарии.',
+            'max' => 'Первый комментарий не может быть длиннее 2200 знаков.',
+        ],
         'ai_generated' => [
             'label' => 'Создано ИИ',
             'hint' => 'Сообщите зрителям, что контент создан или изменён с помощью ИИ.',
diff --git a/lang/tr/posts.php b/lang/tr/posts.php
index ec4f183f34..5a6bbe4ab2 100644
--- a/lang/tr/posts.php
+++ b/lang/tr/posts.php
@@ -448,6 +448,13 @@
                 'travel_and_events' => 'Seyahat ve Etkinlikler',
             ],
         ],
+        'first_comment' => [
+            'label' => 'İlk yorum',
+            'placeholder' => 'İlk yorum için bağlantı ve ekler…',
+            'hint' => 'Video yayınlandıktan hemen sonra kanalınız tarafından gönderilir.',
+            'hint_instagram' => 'Gönderiden hemen sonra paylaşılır — Instagram açıklamalarında tıklanamayan bağlantılar için klasik yer. Yorum iznini vermek için hesabı bir kez yeniden bağlayın.',
+            'max' => 'İlk yorum 2200 karakteri aşamaz.',
+        ],
         'ai_generated' => [
             'label' => 'AI ile üretildi',
             'hint' => 'İzleyicilere içeriğin AI ile üretildiğini veya düzenlendiğini bildirin.',
diff --git a/lang/uk/posts.php b/lang/uk/posts.php
index 431d5574e3..10f471a8bd 100644
--- a/lang/uk/posts.php
+++ b/lang/uk/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => 'Подорожі та події',
             ],
         ],
+        'first_comment' => [
+            'label' => 'Перший коментар',
+            'placeholder' => 'Посилання та доповнення для першого коментаря…',
+            'hint' => 'Публікується від імені каналу одразу після виходу відео.',
+            'hint_instagram' => 'Публікується одразу після поста — класичне місце для посилань, які в описі Instagram неклікабельні. Потрібно один раз перепідключити акаунт, щоб надати право на коментарі.',
+            'max' => 'Перший коментар не може перевищувати 2200 знаків.',
+        ],
         'ai_generated' => [
             'label' => 'Створено AI',
             'hint' => 'Повідомте глядачам, що контент створено або змінено за допомогою AI.',
diff --git a/lang/zh/posts.php b/lang/zh/posts.php
index f5e33de90b..ee76fab1f9 100644
--- a/lang/zh/posts.php
+++ b/lang/zh/posts.php
@@ -446,6 +446,13 @@
                 'travel_and_events' => '旅游和活动',
             ],
         ],
+        'first_comment' => [
+            'label' => '首条评论',
+            'placeholder' => '首条评论中的链接和补充内容…',
+            'hint' => '视频发布后立即以频道名义发表。',
+            'hint_instagram' => '发布后立即评论——这是放置 Instagram 描述中无法点击的链接的经典位置。需重新连接一次账号以授予评论权限。',
+            'max' => '首条评论不能超过 2200 个字符。',
+        ],
         'ai_generated' => [
             'label' => 'AI 生成',
             'hint' => '告诉观众内容是由 AI 生成或编辑的。',
diff --git a/resources/js/components/posts/editor/InstagramSettings.vue b/resources/js/components/posts/editor/InstagramSettings.vue
index aa0fe5c6a0..edfedadcf0 100644
--- a/resources/js/components/posts/editor/InstagramSettings.vue
+++ b/resources/js/components/posts/editor/InstagramSettings.vue
@@ -17,6 +17,7 @@ import {
     index as audioIndex,
     show as audioShow,
 } from '@/actions/App/Http/Controllers/App/InstagramAudioController';
+import CharacterCounter from '@/components/CharacterCounter.vue';
 import InputError from '@/components/InputError.vue';
 import SettingsRow from '@/components/posts/editor/SettingsRow.vue';
 import SettingsSection from '@/components/posts/editor/SettingsSection.vue';
@@ -32,10 +33,12 @@ import {
 import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group';
 import { Skeleton } from '@/components/ui/skeleton';
 import { Switch } from '@/components/ui/switch';
+import { Textarea } from '@/components/ui/textarea';
 import { useReelSoundtrack } from '@/composables/composer/useReelSoundtrack';
 import { useMetaErrors } from '@/composables/useMetaErrors';
 import { instagramProfileUrl } from '@/lib/instagram';
 import { rangeFill } from '@/lib/rangeFill';
+import { toNullableText } from '@/lib/utils';
 import { ContentType } from '@/types/content-type';
 import type { InstagramAudio } from '@/types/instagram';
 import { Platform } from '@/types/platform';
@@ -132,6 +135,13 @@ const shareToFeed = computed({
     set: (value: boolean) => updateMeta({ share_to_feed: value }),
 });
 
+const FIRST_COMMENT_MAX = 2200;
+const firstComment = computed({
+    get: () => toNullableText(props.meta.first_comment) ?? '',
+    set: (value: string) =>
+        updateMeta({ first_comment: toNullableText(value) }),
+});
+
 const selectedAudio = computed(
     () => (props.meta.audio as InstagramAudio | null | undefined) ?? null,
 );
@@ -1017,5 +1027,31 @@ onUnmounted(() => {
                 />
             </div>
         </SettingsRow>
+
+        <SettingsRow
+            :label="$t('posts.form.first_comment.label')"
+            label-for="instagram-first-comment"
+            align-top
+        >
+            <Textarea
+                id="instagram-first-comment"
+                v-model="firstComment"
+                data-testid="instagram-first-comment"
+                :disabled="disabled"
+                :maxlength="FIRST_COMMENT_MAX"
+                :placeholder="$t('posts.form.first_comment.placeholder')"
+                class="field-sizing-fixed min-h-20 w-full resize-y"
+            />
+            <CharacterCounter
+                class="block"
+                :exceeded="firstComment.length > FIRST_COMMENT_MAX"
+                data-testid="instagram-first-comment-count"
+            >
+                {{ firstComment.length }}/{{ FIRST_COMMENT_MAX }}
+            </CharacterCounter>
+            <p class="text-xs text-foreground/60">
+                {{ $t('posts.form.first_comment.hint_instagram') }}
+            </p>
+        </SettingsRow>
     </SettingsSection>
 </template>
diff --git a/resources/js/components/posts/editor/YouTubeSettings.vue b/resources/js/components/posts/editor/YouTubeSettings.vue
index 749799a0c9..3233577870 100644
--- a/resources/js/components/posts/editor/YouTubeSettings.vue
+++ b/resources/js/components/posts/editor/YouTubeSettings.vue
@@ -167,6 +167,16 @@ const descriptionServerError = metaError('description');
 const hasDescriptionError = computed(
     () => !!descriptionIssueKey.value || !!descriptionServerError.value,
 );
+
+const FIRST_COMMENT_MAX = 2200;
+const firstCommentId = computed(
+    () => `youtube-first-comment-${props.platformIndex}`,
+);
+const firstComment = computed({
+    get: () => toNullableText(props.meta.first_comment) ?? '',
+    set: (value: string) => update({ first_comment: toNullableText(value) }),
+});
+const firstCommentError = metaError('first_comment');
 </script>
 
 <template>
@@ -340,5 +350,32 @@ const hasDescriptionError = computed(
                 "
             />
         </SettingsRow>
+        <SettingsRow
+            :label="$t('posts.form.first_comment.label')"
+            :label-for="firstCommentId"
+            align-top
+        >
+            <Textarea
+                :id="firstCommentId"
+                v-model="firstComment"
+                :data-testid="firstCommentId"
+                :disabled="disabled"
+                :maxlength="FIRST_COMMENT_MAX"
+                :aria-invalid="firstCommentError ? true : undefined"
+                :placeholder="$t('posts.form.first_comment.placeholder')"
+                class="field-sizing-fixed min-h-20 w-full resize-y"
+            />
+            <CharacterCounter
+                class="block"
+                :exceeded="firstComment.length > FIRST_COMMENT_MAX"
+                data-testid="youtube-first-comment-count"
+            >
+                {{ firstComment.length }}/{{ FIRST_COMMENT_MAX }}
+            </CharacterCounter>
+            <p class="text-xs text-foreground/60">
+                {{ $t('posts.form.first_comment.hint') }}
+            </p>
+            <InputError :message="firstCommentError" />
+        </SettingsRow>
     </SettingsSection>
 </template>
diff --git a/tests/Feature/Api/PostApiPlatformMetaTest.php b/tests/Feature/Api/PostApiPlatformMetaTest.php
index 9435355c58..9795f7b4c3 100644
--- a/tests/Feature/Api/PostApiPlatformMetaTest.php
+++ b/tests/Feature/Api/PostApiPlatformMetaTest.php
@@ -468,6 +468,39 @@
     Queue::assertPushed(PublishPost::class);
 });
 
+it('persists YouTube first_comment meta on store', function () {
+    $youtube = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::YouTube]);
+
+    $this->withHeaders($this->headers)
+        ->postJson(route('api.posts.store'), [
+            'content' => 'Short title text',
+            'social_account_id' => $youtube->id,
+            'content_type' => ContentType::YouTubeShort->value,
+            'meta' => [
+                'first_comment' => 'More details: https://example.com',
+            ],
+        ])
+        ->assertCreated();
+
+    $meta = Post::where('social_account_id', $youtube->id)->sole()->meta;
+
+    expect(data_get($meta, 'first_comment'))->toBe('More details: https://example.com');
+});
+
+it('rejects a first_comment over the instagram comment limit', function () {
+    $youtube = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::YouTube]);
+
+    $this->withHeaders($this->headers)
+        ->postJson(route('api.posts.store'), [
+            'content' => 'Short title text',
+            'social_account_id' => $youtube->id,
+            'content_type' => ContentType::YouTubeShort->value,
+            'meta' => ['first_comment' => str_repeat('a', 2201)],
+        ])
+        ->assertUnprocessable()
+        ->assertJsonValidationErrors(['meta.first_comment']);
+});
+
 it('persists Pinterest title and link meta on store', function () {
     $pinterest = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::Pinterest]);
 
diff --git a/tests/Feature/Mcp/PostPlatformMetaToolTest.php b/tests/Feature/Mcp/PostPlatformMetaToolTest.php
index 43039a3a77..d9f295e9e3 100644
--- a/tests/Feature/Mcp/PostPlatformMetaToolTest.php
+++ b/tests/Feature/Mcp/PostPlatformMetaToolTest.php
@@ -398,6 +398,26 @@
     Queue::assertPushed(PublishPost::class);
 });
 
+test('create post persists YouTube first_comment meta', function () {
+    $youtube = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::YouTube]);
+
+    $response = TryPostServer::actingAs($this->user)
+        ->tool(CreatePostTool::class, [
+            'content' => 'Short title text',
+            'social_account_id' => $youtube->id,
+            'content_type' => ContentType::YouTubeShort->value,
+            'meta' => [
+                'first_comment' => 'More details: https://example.com',
+            ],
+        ]);
+
+    $response->assertOk();
+
+    $meta = Post::where('social_account_id', $youtube->id)->sole()->meta;
+
+    expect(data_get($meta, 'first_comment'))->toBe('More details: https://example.com');
+});
+
 test('create post persists Pinterest title and link meta', function () {
     $pinterest = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::Pinterest]);
 
diff --git a/tests/Feature/Services/Social/FirstCommentPosterTest.php b/tests/Feature/Services/Social/FirstCommentPosterTest.php
new file mode 100644
index 0000000000..b7a7f666ab
--- /dev/null
+++ b/tests/Feature/Services/Social/FirstCommentPosterTest.php
@@ -0,0 +1,104 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Enums\PostPlatform\ContentType;
+use App\Models\Post;
+use App\Models\SocialAccount;
+use App\Models\User;
+use App\Models\Workspace;
+use App\Services\Social\FirstCommentPoster;
+use Illuminate\Support\Facades\Http;
+
+beforeEach(function () {
+    $this->user = User::factory()->create();
+    $this->workspace = Workspace::factory()->create(['user_id' => $this->user->id]);
+    $this->poster = new FirstCommentPoster;
+});
+
+function makeFirstCommentPost(Workspace $workspace, User $user, SocialAccount $account, ContentType $contentType, ?array $meta): Post
+{
+    return Post::factory()->create([
+        'workspace_id' => $workspace->id,
+        'user_id' => $user->id,
+        'content' => 'Post body',
+        'social_account_id' => $account->id,
+        'platform' => $account->platform,
+        'content_type' => $contentType,
+        'meta' => $meta,
+    ]);
+}
+
+test('posts a youtube first comment via commentThreads.insert', function () {
+    $account = SocialAccount::factory()->youtube()->create(['workspace_id' => $this->workspace->id]);
+    $post = makeFirstCommentPost($this->workspace, $this->user, $account, ContentType::YouTubeShort, [
+        'first_comment' => 'Link: https://example.com',
+    ]);
+
+    Http::fake(['*' => Http::response(['id' => 'thread-1'], 200)]);
+
+    $this->poster->post($post, 'video-123');
+
+    $api = rtrim((string) config('trypost.platforms.youtube.data_api'), '/');
+
+    Http::assertSent(function ($request) use ($api) {
+        return str_starts_with($request->url(), "{$api}/commentThreads")
+            && data_get($request->data(), 'snippet.videoId') === 'video-123'
+            && data_get($request->data(), 'snippet.topLevelComment.snippet.textOriginal') === 'Link: https://example.com';
+    });
+});
+
+test('posts an instagram first comment on the published media', function () {
+    $account = SocialAccount::factory()->instagram()->create(['workspace_id' => $this->workspace->id]);
+    $post = makeFirstCommentPost($this->workspace, $this->user, $account, ContentType::InstagramFeed, [
+        'first_comment' => 'More: https://example.com',
+    ]);
+
+    Http::fake(['*' => Http::response(['id' => 'comment-1'], 200)]);
+
+    $this->poster->post($post, 'media-456');
+
+    $base = $account->platform->instagramGraphBaseUrl();
+
+    Http::assertSent(function ($request) use ($base) {
+        return str_starts_with($request->url(), "{$base}/media-456/comments")
+            && $request['message'] === 'More: https://example.com';
+    });
+});
+
+test('does nothing when first_comment meta is empty', function () {
+    $account = SocialAccount::factory()->youtube()->create(['workspace_id' => $this->workspace->id]);
+    $post = makeFirstCommentPost($this->workspace, $this->user, $account, ContentType::YouTubeShort, ['first_comment' => '   ']);
+
+    Http::fake();
+
+    $this->poster->post($post, 'video-123');
+
+    Http::assertNothingSent();
+});
+
+test('a failed first comment never throws', function () {
+    $account = SocialAccount::factory()->instagram()->create(['workspace_id' => $this->workspace->id]);
+    $post = makeFirstCommentPost($this->workspace, $this->user, $account, ContentType::InstagramFeed, [
+        'first_comment' => 'More: https://example.com',
+    ]);
+
+    Http::fake(['*' => Http::response(['error' => ['message' => 'Missing permission']], 403)]);
+
+    $this->poster->post($post, 'media-456');
+
+    expect(true)->toBeTrue();
+});
+
+test('unsupported platforms are skipped without requests', function () {
+    $account = SocialAccount::factory()->x()->create(['workspace_id' => $this->workspace->id]);
+    $post = makeFirstCommentPost($this->workspace, $this->user, $account, ContentType::XPost, [
+        'first_comment' => 'ignored',
+    ]);
+
+    Http::fake();
+
+    $this->poster->post($post, 'tweet-1');
+
+    Http::assertNothingSent();
+});
diff --git a/tests/Unit/PostPlatformMetaRulesTest.php b/tests/Unit/PostPlatformMetaRulesTest.php
index d2ae6e72ed..21709ed887 100644
--- a/tests/Unit/PostPlatformMetaRulesTest.php
+++ b/tests/Unit/PostPlatformMetaRulesTest.php
@@ -10,7 +10,7 @@
 use App\Support\PostPlatformMetaRules;
 use Illuminate\Support\Facades\Validator;
 
-test('custom meta messages cover pinterest, instagram collaborators and google business', function () {
+test('custom meta messages cover pinterest, instagram collaborators, google business and first-comment fields', function () {
     expect(PostPlatformMetaRules::messages())->toBe([
         'meta.link.url' => __('posts.form.pinterest.link_invalid'),
         'meta.link.max' => __('posts.form.pinterest.link_max'),
@@ -19,6 +19,7 @@
         'meta.collaborators.*.regex' => __('posts.form.instagram.collaborators.invalid'),
         'meta.event.end_date.after_or_equal' => __('posts.form.google_business.event_end_date_before_start'),
         'meta.event.title.max' => __('posts.form.google_business.title_max'),
+        'meta.first_comment.max' => __('posts.form.first_comment.max'),
     ]);
 });
 
@@ -29,6 +30,7 @@
         'meta.link' => __('posts.form.pinterest.link'),
         'meta.event.title' => __('posts.form.google_business.event_title'),
         'meta.call_to_action.url' => __('posts.form.google_business.cta_url'),
+        'meta.first_comment' => __('posts.form.first_comment.label'),
     ]);
 });
 
@@ -55,6 +57,7 @@
             'meta.channel_id',
             'meta.title',
             'meta.link',
+            'meta.first_comment',
         ]);
 });