SAN FRANCISCO, Jan. 1 — Popular Web sites like YouTube and MySpace have hired the equivalent of school hallway monitors to police what visitors to their sites can see and do by cracking down on piracy and depictions of nudity and violence.

So where do the young thrill-seekers go?

Increasingly, to new Web sites like Stickam.com, which is building a business by going where others fear to tread: into the realm of unfiltered live broadcasts from Web cameras.

The site combines elements of more popular sites, but with a twist. In addition to designing their own pages and uploading video clips, its users broadcast live video of themselves and conduct face-to-face video chats with other users, often from their bedrooms and all without monitoring by any of Stickam’s 35 employees.

Other social networks have decided against allowing conversations over live video because of the potential for abuse and opposition from child-safety advocates. “The only thing you get from the combination of Web cams and young people are problems,” said Parry Aftab, executive director of the child protection organization WiredSafety.org. “Web cams are a magnet for sexual predators.”