STEPHENVILLE, Texas — An online network that targets teens – mostly girls – and extorts them into performing horrible acts got its start with a troubled North Texas teen.

Even though that teen was sent to prison, the network he launched has continued to thrive in his absence. The FBI now says the network is more dangerous than ever, and that parents should be on alert . 

It’s one of the darkest threats the FBI has ever faced – "764", a secretive online network where power is measured in pain, and kids are the targets.  

ABC News has been working on this investigation into this network for months . 

“You’re talking about a network of people that is, according to the FBI, potentially a national security threat,” said Pierre Thomas, ABC’s chief justice correspondent.

Even more concern

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