title: Getting Facebook profile pic from user (via Graph) - detect if it's a blank (i.e. default) image?
body: <p>I'm trying to fetch the profile pics of the people commenting on a client's Facebook page, so they can be displayed on the website, etc.</p>
  
  <p>I'm getting the user IDs via the <code>/[page_name]/feed/</code> graph call and I'm putting that into a URL form like so:</p>
  
  <pre><code>$id = $item['from']['id'];
  $link = "http://graph.facebook.com/{$id}/picture?type=large";
  </code></pre>
  
  <p>It's working well - I'm getting a number of profile pictures back, however some look like this: <a href="http://profile.ak.fbcdn.net/static-ak/rsrc.php/v1/yp/r/yDnr5YfbJCH.gif" rel="nofollow">http://profile.ak.fbcdn.net/static-ak/rsrc.php/v1/yp/r/yDnr5YfbJCH.gif</a></p>
  
  <p>I want to only show real profile pics - is there a way of detecting that?</p>