> they are uploading photos of themselves to the Internet all the time

I worried about this at first, too. But I also check, like a good parent. And to my surprise my kid already learned on her own how to mask/blur faces and even details about the inside of her room when sharing photos. And her friends do, too. They are surprisingly savvy about Internet privacy and risks for their age--certainly more cognizant of the dangers than my generation was growing up with the Wild West Internet.