title: Facebook Request Dialog and "app_non_users" filter not working
body: <p>I have problem with apprequests and ['app_non_users'] filter. Code:</p>
  
  <pre><code> window.fbAsyncInit = function() {
      FB.init({appId: '123', status: true, cookie: true, xfbml: true});
    }
  
    function sendRequestViaMultiFriendSelector() {
      FB.ui({
        method: 'apprequests',
        filters: ['app_non_users'],
        message: 'Hello there!'
      }, function callback(response) {
          if (response) {
              //do some stuff
          }
      });
    }
  </code></pre>
  
  <p>And as you might guess facebook displays all friends (even those already using the application). Any suggestion?</p>
  
  <p>Thanks!</p>