I didn't used to like instagram when I thought it was just a bunch of crappy photographers putting filters on bad pictures trying to make it look artsy. When facebook was no longer just a cool place to hang and keep up with what my friends were doing, I moved most of my posts onto instagram. It's a lot harder to get political on there and a lot easier to just share pictures of what is going on in my life with a little blurb.
I think what's ruined it for me are the "social media influencers", the egregious use of filters, and the dime store philosophers: Some dude sitting on a rock with a "successories" quote after it.