title: How can I get the list of facebook id of users that installed my app?
body: <p>recently I create an application that uses facebook login.</p>
  
  <p>I'm not storing the users data, but I'd like know the users facebook id.</p>
  
  <p>How can I get the facebook id of the users that have installed my application?</p>
  
  <p>Thanks.</p>