It's still communicating, and that's what it's for. I mean I get what you're saying, you don't want to communicate anything that's particularly suited to a twitter sort of form, and that that form of communication therefore seems trivial. I'm just saying communication forms a fundamental need, and if something facilitates that then thats what its for.

Announcing or Broadcasting are still forms of communication. Email, IM, and IRC don't really allow you to do that. That's why I think Twitter fills a gap in communication methods. A lot of people don't like to broadcast their life. I understand that, but some people do like to let other people know what's going on.