Tor.com tweets now. You can follow the goings at:
Tor.com Twitter
In my limited experience, Twitter has been the only social networking tool that actually works in the real world. Although Myspace, ugly as it is, is a useful mailing list for events. Facebook may look better than Myspace, but after all the doughnuts and vampire bites I quickly found it to be a complete pain in the ass. Twitter sounded like the dumbest idea, like, evar, but with Patrick Nielsen Hayden's encouragement (yes, I blame you, Patrick) I tried it out. After a slow start, I'm now addicted. I just wish there were more artists on it. But then, it's entirely text based so...