What's this Twitter thing all about?

Flat World Schools SWOT: Twitter Tutorial
Twitter "is a free social messaging utility for staying connected in real-time. Each message is 140 characters or less in length, and is called a tweet." Tweets can be sent from computers, mobile phones, iPod/iTouch, etc. Using Twitter, you decide who to follow and allow people to follow you.

I wasn't exactly sure what to do with Twitter when I first signed on - but in the past 10 days, it's become more clear as I've done some research and gotten active. It's a lot more than typing "I'm eating pasta."