FIX: don't notify on link reflections

app/services/post_alerter.rb

@@ -144,7 +144,7 @@ class PostAlerter
   end
 
   def extract_linked_users(post)
-    post.topic_links.map do |link|
+    post.topic_links.where(reflection: false).map do |link|
       linked_post = link.link_post
       if !linked_post && topic = link.link_topic
         linked_post = topic.posts(post_number: 1).first