Twitter best among rest

Twitter, the popular micro-blogging service that allows users to send messages to large groups of people all at once, has officially become an Internet sensation. Users of all stripes, from your average Joe to big-time celebrities, have embraced the medium as a great way to keep in touch with friends, family and fan bases. Maybe it's the simplicity of the system -- all you really need is a free account and a cell phone. Or maybe it's the ease with which you can send messages to tens of thousands of people. Celebrities like it because they can avoid the pitfalls of the traditional media outlets and deliver information straight from the horse's mouth. The messages, called tweets, can only be 140 characters long, so perhaps the popularity is due to the lack of serious commitment that running a Web site or blog entails.