title: Facebook request dialog
body: <p>I am using FB.ui to enable the user to send requests and I provide a default message.</p>
  
  <pre><code>FB.ui({
          method: 'apprequests',
          message: 'You should learn more about this awesome game.'},
  
  );
  </code></pre>
  
  <p>Is it possible, in a <em>Facebook request dialog</em>, for the user to write his/her own message ?</p>