Cyberextortionists on porn sites are really, really scary

Watching porn online could lead to something more embarrassing than explaining it to your significant other—your computer might be held hostage.

Hackers are threatening porn-site surfers with "ransomware": the shady characters threaten to take your money to let you access lost data. The messages pop up to make it look like they're from the FBI, warning the users they're doing something illegal.

But it's just a scheme from hackers to funnel money from the clueless. And it's working: According to the Ottawa Citizen, cyberextortion is expected to grow in 2013. 

http://www.dailydot.com/society/porn-ransomware-cyber-extortion-hackers/