They chatted with friends, posted pictures, and when they were tired, stretched out on their beds to rest.

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But every so often, a new type of hacker comes along. He secretly burrows his way into your hard drive, then into your life. It was a Saturday night, not much happening in her Long Beach, California, neighborhood, so high school senior Melissa Young was home messing around on her computer.

Her little sister, Suzy, was doing the same thing down the hall.

The house was quiet, save the keyboard tapping in the girls' rooms, when the odd little instant message popped up on Melissa's screen—an IM from Suzy.

(Image via BBC) Young people are using video and webcam chat to hangout with friends and meet new people.

There are risks, such as webcam blackmail that can arise from inappropriate use of these services.

As with all other issues, proactive parenting can have a big impact on reducing the risks.

We have put together some talking points to help you talk about the issue with your child.

Attached to the note was a file labeled simply SCARY. Yeah, the IM had come from her account, but she hadn't sent it. That night, Suzy's 20-year-old friend Nila Westwood got the same note, the same attachment. When she called her friend to see what she'd missed, things actually got freaky: Suzy'd never sent a thing.

Melissa wondered why her goof-off sister was IM'ing from the next room instead of just padding over—she wasn't usually that lazy—so she walked over to see what was up. Unlike Melissa, she opened it, expecting, say, a video of some guy stapling his lip to his chin on You Tube. The girls pieced together the clues and agreed: Suzy's AOL account had been hacked.