Index: src/routes/posts.js
===================================================================
--- src/routes/posts.js	(revision eb852c5856f54a4e8690534406540d8a33e0bfcc)
+++ src/routes/posts.js	(revision c16e0a5a2c2c866ae09afb2b0996809746bc8e4b)
@@ -748,4 +748,8 @@
     db.prepare('SELECT 1 FROM post_likes WHERE post_id = ? AND user_id = ?').get(post.id, req.session.user.id));
 
+  // Inbound fediverse activity (replies/likes/boosts) for this post.
+  let fediverse = { replies: [], likeCount: 0, announceCount: 0, total: 0 };
+  try { fediverse = ActivityPubService.getInteractions(post.id); } catch { /* non-fatal */ }
+
   renderPage(req, res, 'pages/post', {
     post,
@@ -755,4 +759,5 @@
     comments: topLevel,
     totalComments,
+    fediverse,
     likeCount,
     likedByMe,