title: Pick A User Who Liked My Page (Facebook)
body: <p>Through Facebook's API, How do I  randomly pick a user from the list of users who liked my page for a contest? I want my program to pick it, not me randomly scroll through pages of the users on FB.</p>
  
  <p>In addition, if I want to give something to say the 500th person to like the page, how can I do that?</p>
  
  <p>I've been unable to find my answer in their documentation. Thanks!</p>
  
  <p>Edit: I've seen answers here and elsewhere that say it can't be done. Yet companies run promotions like this all the time. What are they doing to do it?</p>