As the current topic has not been updated for quite a while now, I thought it would be easier to open a new topic which can be updated easily. All names are also now hyperlinks to the members' profile.
Forgive me for sounding ignorant, but how exactly do you use this friend code? Do I have to be online or near someone to be able to do multiplayer? Frankly, the only time I tried this multiplayer thing was with GTA4.