Cool. Looks about right to me, not that I'm an expert. Bridgy Fed and Mostr do allow you to chain them together and do Nostr <> AT communication (though more recently there's also Eclipse.Pub that does Nostr <> AT). There are also a few other protocols still in use (Diaspora, DFRN, Zot, Nomad - Diaspora, Friendica, Hubzilla, Streams respectively) although all but Diaspora all internally bridge to Activity Pub so I'm not sure how they'd fit into your model.
this post was submitted on 05 Dec 2025
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Been reading some docs and felt like drawing to get a better picture.
Some things to note:
- Parenthesis indicate bridges
- Fed Bridgy and Mostr appear twice because I don't know if they allow cross-communication
- One-way arrows (→) indicate one-way communication, and two-ways arrows (⇄) indicate the two sides can talk with each other
- Threads to/from Facebook and Instagram communication appears with an interrogation mark because the information I could find didn't feel conclusive and I don't have an account to test myself
- Maybe I missed some bridges and protocols, but that'd be more of a lack of knowing; also intentionally ignored X/Twitter > Nitter > RSS > ActicityPub bridges because it felt too much of a stretch.
Didn't know Friendica and Hubzilla are other protocols. 👀
If you're talking protocols, then why is WordPress there?
If you include Wordpress there are about 100 other softwares that should also show up, but then you also need more paper 😁
Wasn't quite sure how to fit WordPress, as well as either Minds and Threads, as all 3 end up being, from what I could tell, hybrids.
But interesting. Now that you mention it, I remembered NodeBB also implemented ActivityPub compatibility, though can't remember if it's through optional plugins or if it became an ActivityPub platform altogether. Gonna look up what other softwares are in this situation too.
NodeBB supports ActivityPub out of the box (no plugins) as of v4 🙂