Privacy issues abound as users have no control over who views their broadcasts, and all their clicks and interactions as a viewer could be collected or shared.
Via in-app purchase, viewers can purchase coins to give as gifts to broadcasters.
The alleged predator has pleaded not guilty to multiple charges of soliciting a minor.
Most sex crimes against children are committed by people the children know, rather than strangers.
Even those companies with state-of-the-art defenses spend far more time trying to stop online bullying and attempts to sneak profanity past automatic word filters than they do fending off sex predators.
Facebook's software likewise depends on relationship analysis and archives of real chats that preceded sex assaults, Chief Security Officer Joe Sullivan told Reuters in the company's most expansive comments on the subject to date.
Like most of its peers, Facebook generally avoids discussing its safety practices to discourage scare stories, because it doesn't catch many wrongdoers, and to sidestep privacy concerns.