does internet harm our young ones????

Well i think you're mixing two different things up here. Internet is not bad on itself at all. It's a tool full of possibilities for education, entertainment, business etc. But as with most things, this tool can be dangerous if used wrongly, specially by underaged ones. That's why those filters exist, or tracking programs, and of course education and surveillance by the own parents. Their guidance is essential, because their kids will have to use and manage fine in the internet when they grow up...nowadays it's essential so when they're adults then even more.

With proper supervision, the Internet can do more good than harm.