I've met many people I might never see in real life and we've all played many hours together as the hours add up you begin to know that person and I consider some of them good quality friends. Who else feels that way?
Edit: so I guess people feel the same; that's pretty cool I think.
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When I was on 360, I actually knew at least half of the people on my friends list. Now I know like 3, but I have people I play with regularly that I consider to be actual friends.