Unlike a newspaper or television show, social networking is a medium whose content is deeply unpredictable. In the sports pages of a newspaper, an advertiser knows roughly what kind of material its ads will be running next to. But an enormous, highly visible brand may not want to risk seeing its ad wind up on a page such as that run by the actual Facebook group "I've Had Sex with Someone on Facebook," which at press time had 59,353 members. Or consider the MySpace profile (turned up after about two minutes on the site) of 18-year-old "Nikki AKA Death Angel!," which is adorned with the motto "Don't fuckin fuck with ninjette bitch we'll cut ur fuckin head off an give it to ur momma."