diff --git a/app.py b/app.py
index dc60e34..f3330c3 100644
--- a/app.py
+++ b/app.py
@@ -386,14 +386,17 @@ def api_posts():
         platform = request.args.get('platform', '')
         search_query = request.args.get('q', '').lower().strip()
 
-        # Get user's filterset preference (or default to no_filter)
+        # Get user's filterset preference and community selections
         filterset_name = 'no_filter'
+        user_communities = []
         if current_user.is_authenticated:
             try:
                 user_settings = json.loads(current_user.settings) if current_user.settings else {}
                 filterset_name = user_settings.get('filter_set', 'no_filter')
+                user_communities = user_settings.get('communities', [])
             except:
                 filterset_name = 'no_filter'
+                user_communities = []
 
         # Use cached data for better performance
         cached_posts, cached_comments = _load_posts_cache()
@@ -409,6 +412,25 @@ def api_posts():
             if platform and post_data.get('platform', '').lower() != platform.lower():
                 continue
 
+            # Apply user's community preferences (before filterset)
+            if user_communities:
+                post_source = post_data.get('source', '').lower()
+                post_platform = post_data.get('platform', '').lower()
+                
+                # Check if this post matches any of the user's selected communities
+                matches_community = False
+                for selected_community in user_communities:
+                    selected_community = selected_community.lower()
+                    # Match by exact source name or platform name
+                    if (post_source == selected_community or 
+                        post_platform == selected_community or
+                        selected_community in post_source):
+                        matches_community = True
+                        break
+                
+                if not matches_community:
+                    continue
+
             # Apply search filter (before filterset)
             if search_query:
                 title = post_data.get('title', '').lower()