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.
Users could be unnerved about the extent to which their conversations are reviewed, at least by computer programs.'We've never wanted to set up an environment where we have employees looking at private communications, so it's really important that we use technology that has a very low false-positive rate,' he said.
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Officers took control of the teenager's computer and arrested the man the next day, said Special Agent Supervisor Jeffrey Duncan of the Florida Department of Law Enforcement.
Minors don't show up in public searches, only friends of friends can send them Facebook messages, and only friends can chat with them.
Technology is available for verifying the ages of Web and app users.
One of the providers is Aristotle International Inc, which offers a variety of methods, including having a parent vouch for a child and make a token payment with a credit card to establish the parent's identity.
The alleged predator has pleaded not guilty to multiple charges of soliciting a minor.
Duncan, one of a half-dozen law enforcement officials interviewed who praised Facebook for triggering inquiries, said: 'The manner and speed with which they contacted us gave us the ability to respond as soon as possible.'Facebook is among the many companies that are embracing a combination of new technologies and human monitoring to thwart sex predators.