I signed up for Twitter quite a while ago, but never used it. I couldn't quite see the point; if I'm at my PC, I would rather use my weblog if I have something to say. So while I had some followers on Twitter, I never posted any "tweets".
However, I recently came across "twibble", a Twitter client for mobile phones. On my phone, Twitter makes sense to me. The maximum length of a single "tweet" is about the same as an SMS text message, so it's the kind of short thing that phones are good for. So, I've started posting snippets of thoughts to Twitter. If you are interested, feel free to follow my ramblings via Twitter.