Hey chaps and chapesses,
Not sure if it will help or not but the chat room set up for everyone to use (link in my sig) can be another way of getting friend codes, that's one of the reasons I set a new one up. Great for FCs and for invites, keeping track of buddies, having a natter between games etc.
Have a look at the link, it's in its' early stages but the more ppl that try it the more ppl to kill...in the nicest possible way of course.
Hope it helps.