When I have kids I will allow them to go on the Internet, but I will teach them about where to find good content and stuff like that.
They will ultimately have to learn how to do this anyway, so its better to teach them early.
And I dont want to completely block their internet access because their classmates will have it too and it sucks to be the only one who doesnt, you just dont fit in quite as well and arent able to talk about stuff from the internet if you dont know anything about it. (I am speaking from experience)