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Twitter is a site that allows you to post one-line messages about what you’re currently doing—via the web interface, IM, or SMS. You can limit who sees the messages to people you’ve explicitly added to your friends list, or you can make the messages public.
What Twitter does, in a simple way, is merge a number of interesting trends into a single social software usage—like personal blogging, lightweight presence indicators, and IM status messages. It is also very good at getting a simple message across to many people at once. Other people like to use it to say what they did throughout the day because they feel the need to do so, like Kanye West.
