Not to downplay the mental harm discussed in the article, but the more mundane issue you touch on here is what gets to me.

With this constant demonstration of happiness / positivity, it's extremely difficult to get a real, honest read on something. Not everything you ate was incredible, not everywhere you went was perfect. In fact, 50% of them were below average! I wish more people would quit performing and give the real scoop. But that tends to only happen in pretty tight circles now. I noticed this effect even in a group chat of close friends once it grew from 5 to 8.