We are building a solution with social.network, it's not fully completed yet but please keep an eye on it towards the end of the year.
What I really like about the ActivityPub protocol (though it is not perfect), is the way it makes permissionless innovation a thing again. People can build tools and communities to their liking and at the same time be a part of a much larger ecosystem. One example is a rather fresh project based on this protocol, trying to recreate reddit/HN's functionality, only federated: https://dev.narwhal.city/ (https://git.sr.ht/~vpzom/lotide)