Most people by now have heard of Twitter. If you haven't, then get yourself over to www.twitter.com and sign up!
Once you’ve joined, you will see that Twitter is simply a service that enables you to send 140 character long messages that are visible to everyone - 140 characters is not a lot, so your postings need to be short and to the point.
Other Twitter users can "follow" you, which enables them to receive your messages or "tweets" as you send them. These short messages can be submitted via the web, SMS, IM or by using a 3rd party client. This method of concise and easy to do messaging is a great way to get noticed by thousands of people - spreading the word on your business and what it is that you do.
Twitter has seen rapid growth over the past few months, with unique visitors increasing 1,382 percent, from 475,000 unique visitors in February 2008 to 7 million in February 2009. This makes Twitter a great place for businesses to market themselves, having developed into an important part of brand marketing.