A good read. Key bit:

"Obviously, the social networking space is undergoing a major shakeup. Twitter under Elon Musk’s chaotic reign has seemingly created an opportunity for an alternative microblogging service. With #Threads and #Mastodon both embracing #ActivityPub, it might not be one platform that wins out—but an open standard. "

https://www.popsci.com/technology/activitypub-fediverse/