One way is to use the parental controls, they allow you to block programs that you do not want your child to view. Also, schools often have a program that blocks pages, which helps avoid the misuse of the internet at schools. All children need to be watched while on the internet, not continuously but enough to know what they are doing. If you suspect your child is misusing the internet be sure to keep an eye on them and ask questions, also look out for suspicious behaviors.
Chat rooms are a big contributor to online problems, many sex offenders love to spend all their time in them. They start to talk to the kids, and lure them in to them. After that they get them to call them and therefore giving the predator the child's number. Even though the child thought that they followed all their parents rules the predator still got some private information from the child.
The best way to achieve internet safety is to talk to your kids, and only allow so much time on the internet. Keep the computer in an area where all can see, none in the bedrooms. Use the internet with your child, and watch for signs of your child being stalked. All parents need to be aware of the internet problems that are out there, and help their children to learn to avoid them.
Dowshen, S. (2008) Internet Safety. KidsHealth. Retrieved November 15, 2009, from http://kidshealth.org/parent/positive/family/net_safety.html#.