Oh I loved Livejournal. I always used it as such a pure extension of myself — a true diary really, so less community than you’re describing. I agree that it reminds me a lot of Steemit. I agree re: Fandom since Tumblr has left everyone largely in Yahoo’s dust. When Taylor Swift opened her own app I was literally like dang, that was one of the biggest brand-safe audiences Tumblr had left!
I think if we consider Steemit similar to Patreon fandom creators could do quite well here. It is, after all, so community based — fans always have an incredible way of creating community.