Anecdotally, I know several people who shifted from Facebook, with its toxic space for arguments, to Instagram in the last few years.
I stopped using Facebook a few years ago, when it was mainly for a few topic focused groups. I wish there were a way to download all the group posts and comments (or at least the ones I participated in) in some kind of an open text based format I can store locally and refer to. If you know of any such tools, please share.
There’s so much information locked into the platform, and with no way for search engines to index and no easy way to even lookup information within it (Facebook search has always sucked), it’s a huge loss.