Twitter and it a sort of Instant Messenger/micro-blog/text messaging tool. What's cool about this tool, is the ability to just post something you have on your mind, what your up to or a question. If you noticed on the top right-hand side of this site, I have my Twitter posts displayed. Whats also cool about this app is that I have it linked into Facebook! So every time I post something on/through Twitter, My blog gets updated as well as my Facebook status!
You can use this tool is several ways. You can use either the web based application (www.twitter.com), install a 3rd party application locally to your pc/mac/linux machine or have it tied in with your text messaging service on your mobile phone. Once your setup, you simply post something. Anything. Things that your doing, thinking of or simply something you want to share with others. The limitations are 140 characters or less, so make the post nice and sweet. You can see why is is used for short messages, just like a chat or micro-post. By logging into Twitter.com, you can search and add as many friends to follow as you want. So using the web based app or 3rd party app or mobile phone, you can get notified and read all the 'Tweets' that people you follow post. Obviously the more friends or people you follow, the busier things get. There are some people out there that I follow that have thousands of people they follow! Oh and all this is absolutely FREE.
If you want to follow me, add me by signing up for a free Twitter account and follow me. Here's my page on Twitter