I'm pretty new to the idea of the Fediverse and Federation in general. I recently signed up for Mastodon to participate in the Podcast Index Community.
Mastodon is built on top of a protocol ActivityPub, which seems pretty straightforward.
I recently hopped on a Zoom call with Ward Cunningham, who has a group of people building Federated Wiki, but I haven't dug in enough to find out what's running under the hood. It would be cool if it were ActivityPub. I'm looking forward to learning more because Wiki has always had a place in my heart.
There are also Federated Blogs.
I've been following my intuition lately. I come across something interesting and follow the thread, leading me back to where I need to be.