Listen to sex chats

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.The alleged predator has pleaded not guilty to multiple charges of soliciting a minor.

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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.

In addition, Facebook doesn't probe deeply into what it thinks are pre-existing relationships.

If the social-networking giant detects suspicious behavior, it flags the content and determines if further steps, such as informing the police, are required.

The new tidbit about the company's monitoring system comes from a Reuters interview with Facebook Chief Security Officer Joe Sullivan.