I cannot say I am a big believer in Twitter. I guess if I had more free time it would be OK, but between my work, family and this class I really don't have time to add another "social" media that distracts from what I need to do. But now if someone asks, I can say I know how to Twitter!
http://mistreamnet.org/videos/2940/all-in-one-place-itunes-u-in-the-classroom