The online service of the Web start-up Twitter Inc. users asked for one thing: an answer to the question: "What are you doing?" in 140 characters or less.

People type this brief updates, known as "Tweet" Twitter in the site or send them as text messages to Twitter. Friends and colleagues can then check the site to monitor each other’s updates.

When the service first appeared a few years ago, its appeal seemed limited largely to narcissists who wanted to let everyone know what they were doing in real time.

But, as blogs and social-networking sites, Twitter has started to cross into the mainstream, such as a wide range of people find interesting applications for short note.

Doctors are using Twitter to update patients on the office hours. Local groups such as the Los Angeles Fire Department are using it to share details about the service calls with interested residents, occasionally with graphic descriptions of the victims’ conditions.

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