A new survey done by McAfee, the security company, says that younger and younger kids are going online unsupervised. Most US tweens, ages 10 to 12, have at least one social media account and many go online without any supervision from their parents. Despite the dangers, 82 percent of preteens say they think social media sites are very safe, or somewhat safe, and 79 percent of parents agree. Nearly half of youngsters also report sharing personal information online such as their email address, and 28 percent have revealed the school they attend. Many parents are also unaware of the time their children spend online. The poll showed 52 percent of youngsters spending five or more hours a day online but most parents think they spend only one to two hours.