I just scroll past them yawning of course.
However, I do have a friend (more a friend of a friend) who takes selfies on an industrial scale. In my opinion, and other mutual friends it is verging on the dysfunctional.
She never posts her full face either, she hates her mouth, and you can clearly see in family shots, eg a large party where she's in a line or sitting on a random chair, that she will engineer it so her mouth is covered, -by a drink, a child's head, whatever. These are the photos she can't prevent being taken. (There is nothing wrong with her mouth by the way, or any part of her).
With the selfies, she makes herself up and I swear, not one of us knows how she does it: She makes herself look like another person, then posts an 'arty' selfie of half her mouth and one eye, all sultry and ridiculous.
She looks nothing like this in reality.
Here's the thing though. I understand from those closest to her, -and I think it's screamingly obvious, that she has cripplingly low self esteem. She is in an abusive marriage (her 'dh' has apparently spat in her face more than once during a row), and her family are sort of circling around waiting for the relationship to go bang finally, so they can help her.
The sense of unreality persists with her status updates which are all 'perfect little family blah blah' shite. I feel very sorry for her and on the one hand, though it is deeply comical in some ways, there is massive poignancy too, with this woman at least.
I always think of people like this existing in a parallel universe to most of us, the scales haven't dropped from her eyes yet. It's the only explanation for her not being able to see how incredibly bananas she looks to people.
Just struck me as interesting.