Twitter started out as a micro-blogging system that served the basic function of answering the question, “What am I doing now?” Over the last few years, this status-update service has grown in different directions, all of which have been user-driven. Although there are plenty of “I’m at work” updates floating around Twitter, users are expanding the horizons of Twitter into an emergency-update service, information exchange, marketing system, and a more robust status-update system.
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