Twitter's naming is very clever. I was talking to my girlfriend about birds the other day in the park. "I wonder what they're saying? 'I'm here.' 'I'm here?' 'Hungry' 'Scared' 'Happy?'" We decided they're just saying 'tweet tweet.'
A lot of the time that's what we do too. We communicate just for the sake of it. People talk to their babies. It's important to talk to your baby. It doesn't really matter what you say specifically, but you should say nice comforting things. Same with other people. "Hi, Howya goin." "nottaa-bother' 'tweet tweet.'
It still carries information.
In the end Twitter is a nice little service that provides a function that a lot of people enjoy. When seeing it that way it's hard to have something against it. It's only when people start claiming it will replace e-mail or be the news service of the next century that I get annoyed.