When I think about what social medias are left, I can only think about LinkedIn. Interestingly, there seem to have been a recent surge of interest for that platform (especially all the cringe worthy posts that started to pop up).
After reading this article, I am starting to wonder if people didn't simply migrate to LinkedIn because of the degradation of Facebook's quality as a Social Network and as they still feel the need to share their lives, started sharing those cringe posts.