I have not. Last year a few people (a couple of HP staffers and a few Hubbers) got together at "HubCamp" (I think that's what it was being called then) not far from me; but I had something else going on that conflicted with it. That was one thing because the staff were involved. When it comes down to it, though, if it weren't something that involved people like HP staff (or staff from whatever site I was dealing with), I'm not all that comfortable with the idea of meeting "online people" in person.
Pretty much the only socializing I do online is whatever I do on, say, the HP forums (and that's not really "socializing" much, needless to say). My socializing is all done offline.