I follow all my favorite A03 authors, so my tumblr feed is very fandom-heavy yet it's also drama-free: just ignore the algorithm pushed blogs and unfollow/block all the blogs that do try to start or share constant drama and it's perfectly fine even as social media. For reddit I also do not go into the algorithm made feeds, I just visit the four subreddits I like - also drama-free. So imo "all social media is rotten" is a skill issue - specifically, the (lack of) skill to ignore the algorithms and strength to curate your own experience.