Twitter isn't just about finding out about plane crashes and what your best friend ate for lunch. Its uses are evolving, and big corporations are joining the fun. Some corporate accounts serve as a boring PR tool that spews press releases and follows everyone who tweets about their company. But others have found interesting, inventive ways to engage customers on Twitter.

Some corporations, namely @Palm_Inc and @WholeFoods, have used the service to release news and answer questions. Others, such as @DellOutlet and @MotoDeals, have become a hot place to go to find great deals on merchandise. And not to be outdone, companies like @ComcastCares, and @HRBlock, have used Twitter as a new extension to customer service, allowing near real-time responses to difficult questions.

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