Study : 54 percent of Web profiles of 18-year - olds mentioned risky behaviors . But she said 54 percent as a figure for profiles with risky behaviors seems too high , given that most of what happens on social networking sites is `` chit-chat . '' Authors looked at 500 randomly selected Web profiles from 100 teens . Many teens took down content or made it private after e - # ##ing . Experts : Parents must know what their children are doing online .
Study : 54 percent of Web profiles of 18-year - olds mentioned risky behaviors . Authors looked at 500 randomly selected Web profiles from 100 teens . Many teens took down content or made it private after e - # ##ing . Experts : Parents must know what their children are doing online .