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Chris Hadnagy is a social engineer who uses his hacking skills to uncover the identities of people posting child pornography online. CNN Tech's Laurie Segall reports.      

"We typically think of hackers as those who steal your identity, hack your bank account, or disrupt services — just because they can. But in some cases, these internet gurus…

"Ethical hacker and social engineer Chris Hadnagy has helped get child predators off the streets. Now, he's recruiting other hackers to do the same."  

"After Chris finished speaking, I felt compelled to shake his hand and offer him my business card as he sought to establish connections with law enforcement agencies across the country…