title: Find friends active (logged in) on Facebook app right now
body: <p>I know /me/friends will give list of friends who use a particular fb app</p>
  
  <p>This is what I want to do:</p>
  
  <p>if A, B, C are 3 facebook friends using an fb app, all three logged into the app currently, then all the 3 will be visible to each other</p>
  
  <p>If A logged out of the fb app only B and C will be visible to each other</p>
  
  <p>Basically I want to show list of friends currently (real-time) using my facebook app...</p>
  
  <p>Please let me know if it possible and how</p>
  
  <p>Thanks in advance</p>