That's a very good point too 3SD!
But now with a lot of younger kids, adolescents, teenagers etc., computer savvy, getting themselves onto Facebook and Instagram, they are subject to a lot of quite personal influences, and trying to "keep up with the play", are making themselves very vulnerable to possible predator grooming!
Without some sort of parental monitoring and control over the Internet sites they visit and participate in, chances are they may travel the wrong road when making new virtual "friends".
I guess it's even harder now that children in schools having to have their own "tablets" for school makes it even harder to monitor! Even if a parent manages to block some inappropriate sites, some kids are so computer savvy, they'll just find a way to get around it, or find a new avenue to be "included" with their current online peers!
I didn't have a clue why my parents didn't really approve of a couple of my primary school friends (they were twin sisters) when I was a child! I was allowed to invite them to our place to play, but I wasn't allowed to go to their house. I wasn't given an explanation why at the time, but accepted it, but I did notice later, in the summer, when swimming, that these two girls had bruises and welts on their arms and legs and some other marks which I now realise must have been cigarette burns!
I told my Mum, and then she told me that their Dad was not a nice kind man like my Dad, and that he would drink too much beer all day, didn't go to work, and then he would get very angry and hurt his children and their mother, and that was why I wasn't allowed to go to their house, because he might be there and may hurt me too, and it was safer if I didn't go there. (Apparently their mum would get on the turps as well). Poor kids!
Pleased I'm not bringing up children anymore. LOL!!