title: FB.ui dialog not displayed on mobile devices
body: <p>I am using FB.ui to trigger a requests dialog. The dialog loads properly on non-mobile devices. However, it fails to load on mobile devices like iPad. What appears is something like a popup/iframe with a <code>loading-gif</code>.</p>
  
  <pre><code> FB.ui({
              method: 'apprequests', 
              message: 'Hello People',
              title: 'A friendly hello',
              data: 'some-data',
              display: 'touch',
              access_token: my_access_token,
          }, callback);
  </code></pre>
  
  <p>I have tried with <code>display: 'iframe'</code>, <code>display:'popup'</code>, <code>display: 'wap'</code> and <code>display: 'page'</code>. But nothing works. How can I get it working on mobile devices? Thank you.</p>