I can't do 'em. I've done a lot of them, and was in one for almost a year. But, that ended due to lies and "cheating". Hell, no matter how much I liked the person, I couldn't ever do another internet relationship. Though as a person with self destructive tendencies, it's nice to completely hide something that would worry the other to death, which you can't really do in an offline relationship.

But I agree you have to be an introvert to make 'em work.