SAN FRANCISCO - Yahoo, the most-used Internet site, has shut down all its user-created chat rooms amid concerns that adults were using the sites to try to have sex with minors.

Yahoo has closed hundreds of chat rooms recently in a bid to protect children from sexually explicit content. The site closed the user-created rooms, several of which were geared toward pedophilia ...

Yahoo's chat room service has come under fire in the past, with some advertisers withdrawing support for the service amid reports of under-age-themed sex chat rooms on the platform in 2005.