You know one thing I read that was funny is what happens with FF XI players meet each other in RL.
You just said hi, and that's about it. It happened to me, met someone that a friend knew and we didn't really talk.
Funny how things goes sometimes.
I think it depends on the people, to be honest.
When I met someone I was dating on FF, it was kind of weird and I don't know if it ever really got better if I'm honest with myself. That was a horrible relationship(not that they were a bad person, if anything I was).
Met a friend and his girlfriend and we just smoked a lot of weed and hung around campus, not really awkward.
Had a small linkshell gathering with 5 people, just played some drinking games and talked, wasn't awkward either.
Some people are more socially awkward than others, though. I'm sure there's a larger concentration on MMOs than a lot of other places.