The Godfather's Race or Die for the iPhone and iPod Touch uses a friending system that is somewhat varied. The Race or Die Friend Code is central to adding friends; both in terms of enter other people's Race or Die Friend Codes and making your Race or Die Friend Code available to others.
Besides the Race or Die Friend Code system there is the Location function, that allows you to forgo using Race or Die Friend Codes all together and will show you the Race or Die players in your area. You can then send them a friend request, but you have a limited number to hand out. Here are some tips for adding to your crew using the Race or Die Location function.