I get online if I'm too wired to go to bed yet and the bars close and there's no afterparties going on.. or if the parties turned ghey and it's a meatfest, I'd rather come home and post online than hang out w/a bunch of drunk guys.
I'll defend the thread a little, but just a little. I mean, if the party is at my place I will often get online for a few minutes to drunk e-mail/IM someone....