title: Valid user ID cannot be parsed as fbid in fb:admins
body: <p>I want to specify moderators for page comments using FB comments plugin. According to <a href="https://developers.facebook.com/docs/plugins/comments/#setup-account" rel="nofollow">spec</a> I'd set my fbid to <code>fb:admins</code>meta property, however moderation link did not appear. When I look at my page via FB Debugger it shows an error:</p>
  
  <pre><code>Object at URL 'https:XXX' of type 'website' is invalid because the given value 
   '10152336557208977' for property 'fb:admins' could not be parsed as type 'fbid'.
  </code></pre>
  
  <p>Note that 10152336557208977 is my fbid.</p>
  
  <p>When I set <code>fb:app_id</code> instead of <code>fb:admins</code> everything works fine. But I would like to add comments admins via id.</p>
  
  <p>What am I doing wrong?</p>