Nic is right, people use Twitter for a number of different reasons. Unlike Facebook,
on Twitter you can choose to follow people you don't know. When I first started with Twitter, for some reason I started following Lance Armstrong. It was fascinating to read his updates about training schedules, multiple drug tests and even random notes about picking the kids up from school. It provided an insight into him that was intriguing to me and while I wasn't a fan before, I am now.
The same thing goes for a number of other people I follow. Heather is on there and she totally makes me laugh. Random thoughts and quick notes have endeared her to me in a way I can't quite explain.
For me, my life rolls at such a rapid pace sometimes, I love the "micro blogging" aspect of Twitter. While I often don't have time to write a full-fledged post of even some of the coolest things I do, Twitter provides a place for me to post those updates. (On an average week, I do about 7 things that would be considered "blog-worthy") Before Twitter, it was sad to see all the cool things that slipped through the cracks. I wanted to talk about them, but just couldn't. So now I finally have a platform for dumping ideas and the randomness of my life.
I also have met several intriguing people through Twitter. I was blown away when one of my favorite writers contacted me via Direct Message (same 140 character limit but you can only Direct Message aka DM someone you mutually follow). We moved the conversation off Twitter into an e-mail but it was great to touch base with someone I've admired for so long. And HE reached out to ME. Blew my mind....
So for me, Twitter has been great. Not only is it a place for short comments about what I'm up to or what I'm reading, but I've also managed to meet new people or strengthen the bond with others.