I discovered today that @prologic has added #ActivityPub support to their twtxt server software https://yarn.social and its largest instance https://twtxt.net essentially bridging the #fediverse and twtxt networks together.
If you are unfamiliar with #twtxt, it is a different take on decentralized microblogging that has been around for many years, and it is quite interesting to see it now bridged between this side and that one!