Probably say hi. I'd especially like to meet Max, NeutralDrow, TheTygerfire, or sky14kemea. On the other hand, though, some of the guys here (for some reason a lot of them have Vault-tec mascot avatars) are trollish, so it really depends.
Edit: My individual reactions would be:
Max-Say hi with a gun to protect myself. If he doesn't kill me, we'd talk and I'd enjoy his wittiness.
NeutralDrow-Probably bond over our mutual liking of anime and play Tsukihime and Fate/Stay Night while MST3King them.
TheTygerfire-Probably just have random talking, and if by luck some gay-bashing fundies come by (extra points if they're Westboro, even more if it's Fred Phelps) we'd mess around with them.
sky14kemea-Bask in her seemingly limitless optimism and enjoy her brighter view of things.