This is true of any data aggregator and visualizer. I'd argue they, probably next to Twitter, are the best at attempting to handle it within a social context.
I guess my thought about photos is incomplete in that making FB a storage for media means that your mean average of shared media will go up as well (it's already there, might as well). We see this in bulk uploads.
I agree that there is a certain amount of selectivity involved - but we vary as individuals. I think only in the last couple of years, after the fad of being able to toss everything online in heaps - have we begun to understood how our online perception is made.
"As for Facebook Messenger, I'll be damned if I let Facebook permanently record every last one of my private message for eternity."
Agreed. That's why I'm off it.