What Alan said. My personal twitter account is all but dead. I find it much easier to do the same thing on facebook. Project 42 Radio is on Twitter, but I'm using it mainly as a promotional tool. It updates 2-3 times per hour with what's currently playing. Then, there's the twitter page for my terrestrial radio show, which I use to pass along interesting/funny/stupid links, music news and the occasional stupid comment by me. Despite all those accounts, I spend more time with Facebook.
UPDATE: I've left Twitter. No time for it anymore, really.