To answer Jill's question about twitter. I'm no authority because I don't tweet although I did for a short time. I think twitter is one step down the social ladder from blogs and facebook. Shorter and more public. I think. It can go out over phones. Who would want to read anything that way? Here' an interesting article in Slate about what the author calls orphaned tweets, people who sign up for twitter, post once, and then are never heard from again. It's all very interesting.
Let's see. The ladder would go (top to bottom) epic novels, romance novels, literary journals, newspapers, tabloids, blogs, facebook, twitter. I have probably left out a few.