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...