With the exception of HD Brows, knickers skimming skirts etc, my DD does constant selfies and tagging and the whole lot.
She's a perfectly normal, nice young woman who is just embracing social media and interacting with her peers, of whom some are into make-up and fashion, some obsessed with Harry Potter or Dr Who, others are completely obsessed with alternative music. Not all do the selfies. Most do the tagging and follow the new social-media etiquette of fishing for compliments, receiving compliments, returning compliments
Had I had access to social media at the same age, I dread to think of the embarrassment I'd have caused.
As it was I just strutted around in knicker-skimming skirts, body tops, Nike hi-tops and unblended, orange foundation, honking of Body Shop Dewberry perfume .
She will find her own way.
What you don't want to do is teach her that other people choosing to do different to her are sneer-worthy or somehow below her. That's for us as experienced bitter grown-ups to do, quietly and amongst ourselves.
Teenagers have one aim in life - to test boundaries and make mistakes and learn from those mistakes. If that includes posting a zillion duck face pictures, then so be it*.
*as long as us old people can snigger quietly and be thankful that our transition from child to adult isn't documented and available for all to see 