Is Twitter the news outlet for the 21st century?

NEW YORK -- Cassy Hayes and Jasmine Coleman were among the first fans to arrive outside the Ronald Reagan UCLA Medical Center in Los Angeles where Michael Jackson was brought and later pronounced dead.

How had Hayes, 25, and Coleman, 21, heard the news so quickly?

Twitter.

The two young women had learned about Jackson's health like so many who get their news nowadays: by reading the ever-flowing feed of real-time information on the microblogging service.

Jackson's unexpected death at 50 was just the latest major news event where Twitter played a central role. But just as quickly as Twitter has emerged as a news source, so, too, has its susceptibility to false rumors become abundantly apparent.

The extraordinary amount of news coverage the mainstream media has recently devoted to Twitter has led some to think the press is in love with the 3-year-old microblogging service. But it's a jealous love.

Twitter's constantly updating record of up-to-the-minute reaction has in some instances threatened to usurp media coverage of breaking news. It has also helped many celebrities, athletes and politicians bypass the media to get their message directly to their audience.

Make no mistake about it, Twitter has in many ways been a boon to the media. It's one more way a story might go viral and it's arguably the best way for a news outlet to get closer to their readership. Most outlets now have a presence on Twitter with a feed directing readers to their respective sites.

But even in an Internet world that has for years eroded the distance between media and consumer, Twitter is a jolt of democratization to journalism.

To date, the most salient, powerful example of Twitter's influence has been Iranian protesters using the service (among many other methods) to assemble marches against what they feel has been an unjust election.

Early in the protests, the State Department even urged Twitter to put off maintenance that would have temporarily cut off service. Twitter is difficult for governments to block because tweets — 140 characters or less — can be uploaded from mobile phones like a text message. (The Iranian government has nevertheless often succeeded in blocking Twitter, Facebook and other social networks.)