title: Facebook api - Invite only those that don't have the app
body: <p>I'm using this method in order to allow the end user to invite friends:</p>
  
  <pre><code>     FB.ui({method: 'apprequests', message: 'app message!', data:'tracking information for the user'});
  </code></pre>
  
  <p>The user is prompted with a facebook dialog in which he can choose to invite:</p>
  
  <ol>
  <li>All friends</li>
  <li>my app users (the users that have the app installed/allowed)</li>
  <li>Friends to Invite (those that don't have the app installed - my goal)</li>
  </ol>
  
  <p>Or in a brief image:</p>
  
  <p><img src="https://i.stack.imgur.com/kHp6t.png" alt="enter image description here"></p>
  
  <p>I don't want the end user to have a choice here, only prompt the third option - those that don't have the app.</p>
  
  <p>Can someone point me to the right direction on this?
  I'm using php + facebook's php sdk.</p>