"But isn't facial recognition face books raison d'etre?
Perhaps, but what happens if said young victim later attempts to post a perfectly innocent self portrait picture, which then gets flagged, deleted and their account automatically banned due to a facial recognition match?
I've also seen other suggestions that Facebook should be held to the same standard as magazine publishers etc. Consider though that the effort to collate data, edit, print, distribute and sell a magazine or newspaper requires considerable financial outlay, significant amounts of specialist equipment, and a number of bottlenecks that aren't completely automated. This puts publishing images in physical print beyond the reach of most people.
Anyone can post anything on the internet from a mobile phone that (at least here in Australia) can be obtained for very little immediate financial outlay.
This isn't even comparing apples to oranges.
I suspect that if Facebook was required to vet every image posted (or even only a percentage based off some kind of heuristic scan) with human eyes, they would need to hire a truly insane number of people, and things would still potentially slip through the cracks.