If you’re not already familiar with twitter, then you’re currently missing out on one of the ‘newest’ (although Twitter is past it’s second birthday) social utility/networking websites sweeping the web.
To get a glimpse of the basic concept of twitter take a look at this video introduction from Common Craft:

With the premise of ‘What are you doing?‘  twitter users can post any open-ended message, thought, url/link, question, etc as long as it fits into the space of 140 characters (text letters).  Aside from ‘tweeting’ your own messages, you can ‘follow’ …