I am absolutely not a fan of social media for young minds. Easily led, easily subverted children are ripe for anybody who wants to exploit them. I am happy to have raised my kids before the internet took over completely. We did have a computer but it was not something the kids were allowed to mess with.
That being said, Parents have to be diligent with their monitoring and not simply rely on government or companies to watch out for their kids. Monitor and inform, over and over.