Conspicuously missing, as it always is from these sorts of articles: Livejournal. A quieter, more thoughtful sort of social media, built around long posts, the occasional essay, threaded comments, and much more sophisticated privacy management than most modern sites ever touch, which was happily used by GenX non-techies.
Sold to a succession of owners, it ended up in the hands of
Russians after it established a strong audience there. I still have an account there but it’s dormant because I never agreed to the new terms and conditions that forbid discussion of LGBTQ issues.