I’ve begun to wonder about this question. There’s nothing implied in the existence of the fediverse that it will include every site, and there’s nothing implied in the existence of every non-fediverse site which would stop them from forming their own fediverse. One could technically say email providers have already achieved this, though this only really applies to email providers which doesn’t make it as useful as the fediverse we know and love. Are there actually other fediverses out there?
ActivityPub is not the only nor the first distributed/federated social network, but it has come to be rather dominant at the moment, largely thanks to Mastodon’s popularity. Some others seem to have faded into the background, like for instance diaspora.
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In the 00s there were these special walkie-talkies that would set up an independent mesh network to communicate without cell service or internet connectivity. That was more peer to peer than federation, I guess, but it’s a pretty cool invention that was only used to send messages between Barbie coloured pieces of plastic.
Meshtastic is trying to do something similar right now, I’m not sure how much Barbie colored plastic is involved though. I wonder what kind of tech those were using, I’ve never heard of it before and Google isn’t being helpful.
… Wait, are you taking about Cybiko? I wanted one of those when I was a kid even though I didn’t know anyone who had one and didn’t live somewhere with the density to really use the tech.
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Before the fediverse we already had the IndieWeb with Webmentions and microformats. And before that we had the Tent protocol. And before that we had the blogosphere with webrings, Pingbacks, Trackbacks and RSS.
I’m not an expert on this, but the fediverse is just a collection of things that can all communicate on a federated standard. It’s just like email, you can use whatever mail provider you want but you can email anyone else using email.
I guess your question is kind of like “are there other emails?” - and yeah, I guess there are other platforms where you can communicate and send messages, but they aren’t email.
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another is the hypertext transfer protocol… (?!)
Smolweb