Facebook paid a cybersecurity firm six figures to develop a zero-day in a Tor-reliant operating system in order to unmask a man who spent years sextorting hundreds of young girls, threatening to shoot or blow up their schools if they didn’t comply, Motherboard’s Vice has learned. We already knew from court documents that the FBI tricked the man into opening a booby-trapped video – purportedly of child sexual abuse, though it held no such thing – that exposed his IP address.

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