Interestin' read.
You mentioned about the girl posting all the party debauchery on FB - and yet her family were posting alongside of it as though condoning it all - turning a blind eye to it.
I'm wondering - she may have had the filters set on FB so her family didn't see certain content. Perhaps they were only seeing the sanitized version of her profile?
At any rate...slightly creepy voyeurism aside
- you make some interesting observations.