title: FB.Event.subscribe('edge.create') not firing
body: <p>I'm trying to make some functionality happen when the like button in a like box is clicked, however the function isn't firing (as well as two cross-domain errors appearing in the console, but I figure that's unrelated.)</p>
  
  <p>Basically the code I'm using:</p>
  
  <pre><code>&lt;div id="fb-root"&gt;
      &lt;fb:like-box href="//www.facebook.com/MYPAGE" width="292" height="290"
       show_faces="true" stream="false" header="true"&gt;&lt;/fb:like-box&gt;
  &lt;/div&gt;
  
  &lt;script&gt;
      window.fbAsyncInit = function() {
          FB.init({
              appId: 'MYID',
              status: true,
              cookie: true,
              xfbml: true
          });
  
          FB.Event.subscribe('edge.create', function (response) {
                  alert('You liked the URL: ' + response);
          });
      };
  
      (function(d) {
          var js, id = 'facebook-jssdk'; if (d.getElementById(id)) { return; }
          js = d.createElement('script'); js.id = id; js.async = true;
          js.src = "//connect.facebook.net/en_US/all.js";
          d.getElementsByTagName('head')[0].appendChild(js);
      }(document));
  &lt;/script&gt;
  </code></pre>
  
  <p>MYPAGE and MYID are valid in the actual code, of course. 95% of the code is just copy/pasted, so I have no idea why it isn't working. If it's something obvious, then this should be easy points.</p>
  
  <p>Any help would be very appreciated.</p>
  
  <p>Edit- Oh and the HTML tag of course:</p>
  
  <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:fb="http://www.facebook.com/2008/fbml"&gt;
  </code></pre>