Inappropriate use of digital media

I do not use any type of social media as I don't think it is necessary in my life.  I don't understand why any parent would want to be posting pictures of their children onto social media sites or allowing their children to be posting.  Do they realize who could be looking at those pictures and how unsafe it is?  I think as parents and grandparents, we have a responsibility to teach our families and to communicate in ways that are safe and appropriate.