title: @ Mentions on Facebook, linking content from my App
body: <p>I know that there's no API from Facebook for adding @mentions in the post from Apps &amp; that the message_tags are read-only, but how the other Apps on Facebook link content on the messages in their posts?</p>
  
  <p><img src="https://i.stack.imgur.com/7GKOZ.png" alt="enter image description here"></p>