I feel that pretenses of the life you pretend to live are more evident on Instagram than anywhere else -- the site is all about portraying yourself in the best light possible, or at least, that is how many of the people I know seem to use it. Having not had it for a couple years, I can safely say that when I do want to be on it again, it's usually just a play on the part of my ego that wants some attention from the like notifications. I can't divorce my use of Instagram from my inner cravings of external validation. It can't just be about what I'm posting, it's always about something that's me me me. This may be true of all interactions, I don't know, but when it's systematically in front of me on my phone every waking hour, it becomes problematic.
In other words, most of what I saw on Instagram was people trying to get followers and likes, trying to be like some "adventure photographer", whatever the hell that means. The feeds became clogged with homogenous shots of feet over the same beaches, curving roads, VW vans, etc. It became about the aesthetic you show, rather than the person and events that you are.