Twitter is a new mobile messaging service. Think of it as quick/mobile blogging. I added a Twitter Widget to the right so now when you check Kenny Kellogg, you can see what deep thought or random musing I've had lately.
The service works like this:
1) You go to www.twitter.com and set up an account (takes 2 minutes),
2) You run an address book search and it tells you who you know already using Twitter,
3) You elect to "follow" those who you like or think are interesting. Whenever they text something into Twitter, it get's sent to you.
4) Let your friends know you are on the service now, then Text something to Twitter yourself and watch as your audience builds.
I've started playing around with Twitter a lot recently and I think it could be pretty powerful and is already super cool. Last night, I was "Twittering" from the Andrew Bird concert. If you had been following my Twitters, you would have known I was there and how epic it was, and could have run down to the concert in mid-show. Or maybe you would have just listened to a few Andrew Bird songs real-time. Or you could have introduced me to another friend who just happened to be at the concert.
Hopefully these scenarios paint a bit of a picture. It's a cool service and can be integrated into your Facebook Update that friends on that service see.
Check it out. To follow me, my username is "scottorn."