Com and SafeTeens. The main factor is that parents have some control over children under age 12. Parents can monitor kids' behavior. Kids learn through parents, so SafeKids. Com is to help parents educate children about the Internet.
Teenagers are far less parent-influenced and more influenced by peer pressure.
They're more curious, more interested in sexually explicit material. Teens are also far more likely to get together with someone they've met on-line, which is what I'm really concerned about. Teens may also have money or credit cards. That opens them to exploitation. It's not effective with teenagers, who figure out how to get around it.