Osako said the company decided to close the chat rooms, which were online discussion venues that any Yahoo users could create, because it is working on a better version."We are working on improvements to enhance the user experience and compliance with our terms of service," she said.Yahoo's "terms of service" agreement states that users must agree not to use any of the company's products or services to "harm minors in any way" or to e-mail or transmit "vulgar" or "obscene" content.The company did not say Thursday when the service will return or how it will operate when it does.

Chat sites for sex-10Chat sites for sex-27Chat sites for sex-51

Yahoo spokeswoman Mary Osako would not say whether the decision was in response to a series on KPRC, the NBC affiliate in Houston, that showed online discussions bearing titles such as "9-17 Year Olds Wantin' Sex" and "Girls 12 and Under for Older Guys."Some of Yahoo's advertisers, such as Pepsico Inc.

and State Farm Insurance Cos., said Thursday that they pulled their advertising because of the series."We were completely unaware that our ads were associated with these chat rooms in any way," Pepsico spokesman David De Cecco said.

"As soon as we found out, we worked with Yahoo to remove them immediately from the site."State Farm spokesman Phil Supple said his company was shocked when it saw where some of its ads were appearing.

State Farm stopped advertising with Yahoo in April as the TV station was preparing its report, Supple said, but resumed after being assured its spots would not appear on chat-room pages.

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Internet portal Yahoo shut down its user-created chat rooms after a television news series showed the online service used in apparent attempts to lure children for sex.

Aftab said she would be happy for the company to bring the service back if there were a way to keep children safe."Yahoo has always cared a lot about these issues, but they've mostly worked behind the scenes," she said.

"If there's anybody I would trust to do this right, it would be them."This is not the first time Yahoo's image has risked being tarnished by people seeking to lure children or to trade pornographic material involving minors.

A 2001 FBI investigation targeted certain Yahoo users and resulted in the arrest of more than 100 people.