diff --git a/lib/shared/farcaster/farcaster-hooks.js b/lib/shared/farcaster/farcaster-hooks.js
--- a/lib/shared/farcaster/farcaster-hooks.js
+++ b/lib/shared/farcaster/farcaster-hooks.js
@@ -44,6 +44,7 @@
 function useFetchConversation(): (
   conversationID: string,
 ) => Promise<?FarcasterConversation> {
+  const fetchUsersByFIDs = useGetCommFCUsersForFIDs();
   const fetchFarcasterConversation = useFetchFarcasterConversation();
   const dispatch = useDispatch();
 
@@ -59,7 +60,29 @@
         }
 
         const farcasterConversation = conversationResult.result.conversation;
-        const thread = createFarcasterRawThreadInfo(farcasterConversation);
+        let thread = createFarcasterRawThreadInfo(farcasterConversation);
+        const fids = thread.members.map(member => member.id);
+        const commFCUsersForFIDs = await fetchUsersByFIDs(fids);
+        const threadMembers = thread.members.map(member => ({
+          ...member,
+          id:
+            commFCUsersForFIDs.get(member.id)?.userID ??
+            userIDFromFID(member.id),
+        }));
+
+        thread = {
+          ...thread,
+          members: threadMembers,
+        };
+
+        if (threadMembers.length > 0) {
+          const newUserIDs = threadMembers.map(member => member.id);
+          dispatch({
+            type: processNewUserIDsActionType,
+            payload: { userIDs: newUserIDs },
+          });
+        }
+
         const update = {
           type: updateTypes.JOIN_THREAD,
           id: uuid.v4(),
@@ -84,7 +107,7 @@
         return null;
       }
     },
-    [fetchFarcasterConversation, dispatch],
+    [fetchFarcasterConversation, fetchUsersByFIDs, dispatch],
   );
 }