title: Using Facebook's API to post a video using the feed dialog fails
body: <p>I'm trying to post a video to a user's timeline using Facebook's feed dialog. When I use the javascript SDK with:</p>
  
  <pre><code>FB.ui({
       method:'feed',
       name: 'testing',
       link: 'http://www.facebook.com',
       picture: 'http://img.youtube.com/vi/1CE6W5BubQo/0.jpg',
       source: 'http://www.youtube.com/watch?v=1CE6W5BubQo'
  });
  </code></pre>
  
  <p>I get: </p>
  
  <p><img src="https://i.stack.imgur.com/6ftR3.png" alt="As you can see, no thumbnail and no video player"></p>
  
  <p>And this is missing the thumbnail and video player. I tried adding <code>type: 'video'</code> to the parameters and I also tried replacing the <code>source</code> parameter with a direct link to the .swf file, but that didn't help. I'm not sure if this is a bug or if I'm doing something wrong. Any ideas?</p>