I actually use this to predict which of the ‘happy couples’ will be first to break up. I’m rarely wrong!
FB? they are supposed to be your friends. Some friend you are. Bloody hell what a load of tripe.
We regularly post pictures (god, selfies! no make-up, wrinkles and grey hair) of us doing things: holiday, at a famous landmark, at a nice place, at the football stadium, at a rugby much, at a gig whatever whatever.
Any of my friends who was posting any of the tripe that I'm seeing people post about their "friends" here would soon be unfriended. If you don't like it, scroll past, unfriend, whatever. But don't ever tell me how to use my own social media.
Re the self-love being a good thing in some respects. If more people than young women posted selfies, maybe the young women might get less of the flack? Might see what other people look like and cut down on the filters etc? who knows. It's the internet, as they say: YMMV.
(incidentally, i did a quick straw poll on my own fb about this and everyone, without exception, said things like: scroll on, don't look and "they should get to fuck telling people what to do" 
)