The average high school junior has 802 Facebook friends. About a quarter of all students with a Facebook account either have risky privacy settings (open to strangers) or don’t know what their settings are.

Students who shared their password with a friend were 2-3 times more likely to report that someone logged into their online account without their permission than students who had never shared their password with anyone.

The two most popular websites amongst students of all ages are Facebook (62.8%) and YouTube (31.9%).

via Children Online: Our Research on the Internet and Cell Phone Behavior of Children and Teens.