Although the internet may be one way adolescents attempt to establish themselves as separate, unique individuals who have a social world of their own, that doesn't mean parents shouldn't be involved. Exactly the opposite is true. As is true of all adolescent activities, they need at least SOME supervision to stay on track and avoid trouble.
Some parents fall into the trap of a benign neglect.
My kids have to learn about computers. They have to keep up with the other kids. But getting involved doesn't just mean supervising in order to avert trouble. The computer and cyberspace also can become an excellent way for parents and adolescents to have fun together, to get to know each other better. You don't have to become a hacker yourself, but read up on the topic.