Parents consistently underestimate how much time their kids spend on social networks and how often they engage in risky behavior, such as posting revealing photos of themselves, bullying other kids or hacking into their friends' accounts. The study mirrors an earlier report from Common Sense Media on kids using technology to cheat in school.

Here's a sample of the new report's findings:
•       37% of teens said they used social networks to make fun of other students, but only 18% of parents believe their own angels do so.
•       13% of teens said they posted naked or semi-naked photos or videos of themselves. Only 2% of parents said their kids have done that.
•       24% of teens said they signed on to someone else's account without permission, while only 4% of parents said their kids have done that.
•       28% of teens posted personal information that they normally would not have revealed in public, but 16% of parents said their kids did that.