There's a lot of cool things going on with the wider #fediverse
. Many of the ever-growing platforms are capable of interoperability through federation, and many are also getting specialized clients. There's some interesting research going into permissions systems and privacy.
A while back, I wrote about some of the emergent concepts of what's brewing, and what could eventually form an absolutely incredible platform: https://deadsuperhero.com/2022/02/towards-a-greater-federated-architecture/