Earlier quoted context omitted.
I agree with you that I wish social media was full of more posts like this, but foodgrams and humble brags as you put it are also one of the reasons I avoid social media these days. Seeing a feed of the best moments of other peoples lives leaves me feeling depressed. "Comparison is the thief of joy." I'm happy for my friends, but seeing it all collected in one place makes my own life feel inadequate. I'm much happier…
It's strange... I thought we were wired as a species to live vicariously, to feel joy when others are blessed, and feel pain when they suffer. You're not the only one that doesn't get that out of Facebook... Why? Is it the quantity? The format? What turns it into a place of covetousness and bitterness?
There's also the asynchronous nature. If you're out with friends and hear about their engagement after the fact (among other catching up), that's one thing. But when you're sitting on the couch lonely and see photos from moments after the engagement (and nothing else), it's just that much more of a gap.
Then throw in everyone's highlights with their outrage and some random shared clickbait (fwd:fwd:fwd:fwd:You won't believe what this evil politician did!), and it's just toxic.