title: Facebook Interest Graph Api always returning empty results
body: <p>I have a question regarding interests graph api that makes me pretty much confuse</p>
  
  <pre><code>/{user-id}/interests
  </code></pre>
  
  <p>I run it on graph tools but always getting an empty result and I'm aware that this method need an extended permission "user_interests"</p>
  
  <p>How come that I always get the empty result and in which part of user facebook profile that can be said as user interest?</p>