The two main microblogging families are Mastodon and Misskey (with all their respective forks). If you really prefer the former you should try the MozillaSocial instance. The backend is a fork of Mastodon and the frontend is a fork of Elk.
The @social job listings for backend engineers want people experienced with JavaScript and Rust. Ruby/Rails (Mastodon’s backend stack) is not mentioned.
It already uses Elk for its frontend instead of Mastodon. I wonder if they intend to create a new compatible backend too. I would welcome another high quality ActivityPub implementation, especially in programming languages I prefer.
I'm confused, I thought @mozilla stopped development on #MozillaSocial and instead the devs started a fork called #Firefly. Why are there now new builds of MozillaSocial?