So I have been thinking about this for a while and i think it would be really cool. You would be able to add anyone in-game and they would be added to the friends list already in the game. It would also work between iOS/Android. I have made some pictures of what i think it would look like http://ift.tt/1QNBzyX http://ift.tt/1iDNWm2

EDIT: Added Pictures Link to thread on Forums http://ift.tt/1QNBxqU