It is not a secret that not all websites on the Internet are suitable to be seen and visited by children. Children are some of the most vulnerable Internet users and they should be in my opinion supervised at all times while spending time surfing the Web.
There are even some unscrupulous people on the Internet preying on children hoping that they will fall victim to their elaborate scams. It is very easy to convince a child to do something bad like sharing the credit card details of his parents or even many other things that can be bad for the children. If you are a parent, I want you to be aware of that and I want to encourage you to supervise your kids at all times.