Unlike traditional social networks, Scuttlebutt has no servers. Members store all their personal data on their own computer or phone, and connect directly to their friends' devices in order to update statuses. Scuttlebutt also works offline.
It's currently available on @fdroidorg and Google Play. (Note it's still in beta and many features are missing.)
Yet I wonder if these initiatives can ever become truly big, unless they focus more on foundational basis (specs, standardization, documentation, community-building). #ActivityPub started with such basis (though it should now be maintained, updated, consolidated, IMHO. Fragmentation risks)
The developer of Manyverse put it quite well: the concept of Scuttlebutt is a lifeboat rather than a cruise ship.
If the internet, for whatever reason, is unusable, Scuttlebutt is there as an alternative option.
If something nasty happens in the near future, it could be especially important to have such options.
@switchingsocial yes, I believe he is a digital nomad himself living on a sailboat (but I did not check if I am right, or it is someone else).
Manyverse is a work in progress, and unfortunately connections are somewhat flaky :(
The developer @staltz wrote a very detailed and candid article about this last autumn:
tl:dr: Connections often don't work properly, partly because phone networks aren't optimised for peer-to-peer social networks. However, the develoeprs are working on it and have some interesting new techniques to improve the situation.
mastodon.at is a microblogging site that federates with most instances on the Fediverse.