Just let people add whoever they want and hope someone else on their list has their code. If not, play one of the other three online modes where you're guarenteed a match. If you're someone who doesn't post much or just joined for friend codes, then why not play random? It's the same thing, even if you're part of this forum, no one might know who you are.
first sentance, first sentance, first sentace....Hypocrite was a greek philosopher