CNET reports that according to a new study from Harris Interactive, a third of parents surveyed said they don’t feel confident about instructing their children in safe internet usage. That said, 94 percent of parents surveyed said that they do turn to web content filters, monitoring software, and outside advice from friends on how to best keep their children safe online. The poll, commissioned to Harris Interactive by Cable in the Classroom, was unveiled at a national PTA conference in New York City. It seeks to address parents’ growing concerns over kids’ web privacy and the dangers of social networking sites such as MySpace. Children are currently in the spotlight because according to Cable in the Classroom, high school kids can spend up to 5.1 hours a day online when not in school, while middle school students spend about 4.9 hours daily…