The challenges for parents may be new, but they are not insurmountable.
Many psychologists recommend changing the way the computer is used.
Put it in a family room, where adults and teens have more oppotunities to discuss what's coming into the house. Filters such as Net Nanny, restrict which sites users can visit, but smart kids can get around them often by using a friend's computer. Idit Harel, founder of the kid-friendly site MaMaMedia, highly recommends playing videogames along with your kids.