title: How to get FB id without connecting
body: <p>I know at first this sounds evil, but I'm not trying to be at all.  I'm only trying to get the users Facebook ID without having to connect to FB.  I basically want to unique the user on my site by their social id.</p>
  
  <p>If you use facebook's comments feature, without being connected, they have your ID and picture. The picture is easy because it's just a URL, but that ID, how do they get it?</p>
  
  <p>Obviously they use iFrames, and maybe that's where the story ends. Because of cross domain scripting I can't get into that iFrame to grab the ID.  This is a case where it's so close yet so far away. I can get there via dev tools but I can't get that ID via JS.</p>
  
  <p>So the question is, does anyone know a way to get a users facebook ID without having to connect to facebook first.</p>
  
  <p>Thanks!</p>