My partner has an Instagram account and I sometimes look along over their shoulder (with their knowledge!). It feels a bit weird though, because the algorithm is not in tune with what I like and to me it just seems like an endless list of similar videos. Yet my partner can easily spend an hour just scrolling through all of that stuff.

Personally, I had a Facebook account when it was still newish, but I got rid of it. I was just getting more and more depressed wondering why my life wasn't as great as that of others. It took me a while to realize that, of course, they were just trying to show off to keep up with others showing off.
Other than that, I lost some really good long-distance friends to Facebook. One of my best friends went from fun exchanges over long e-mails to only wanting to post on Facebook to her followers. Still hurts when I think about it.

So no.. I am not a Facebook or Instagram user, and never will be (again).