Blogs have made it more difficult for mainstream news organizations “to sit on a story.”

Blogs have drawn attention to political stories that more established media outlets then report on, and exposed flawed journalism by those same newspapers and television news programs. But some at the gathering said they face a near-constant struggle to establish the credibility enjoyed by professionals.

“Things get picked up by bloggers that take awhile to get picked up by the mainstream media,” said Mark Glaser, a columnist for the Online Journalism Review who writes about web logs. “Bloggers have to start from scratch in building trust.”

Glaser noted the importance of bloggers in tearing down CBS News’ election season story about President Bush’s service in the Texas Air National Guard. The constant barrage of questions and charges from the Web kept heat on the network until it admitted a mistake in relying on what turned out to be fake documents.

Mindy McAdams, a University of Florida journalism professor, applauded bloggers’ efforts but urged them to adhere to ethical standards held by mainstream journalists.

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