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I've tested using nostr and it seems cool (I love decentralization), but I don't really know what it is. Your question made me curious about the differences between nostr and activitypub, so I asked my AI.
I thought the response was useful so I'll paste it here. If you don't like AI responses, stop reading this post here.
[Edit: moved AI responses into spoiler]
AI response
I asked: Explain the main differences and similarities between nostr and activitypub.Qwen-3. 8 said: Both are open, JSON-based protocols for decentralized social media, but they take opposite ends of the design spectrum.
TL;DR: Nostr is a minimal client↔relay broadcast protocol where you are your keypair. ActivityPub is a heavy server↔server federation protocol where servers host accounts and talk to each other.
Main differences
@you@instance.social) hosted and controlled by a serverOne nuance: Nostr isn't really "federation" at all — there's no server-to-server sync. It's a publish/subscribe model where your client aggregates multiple relays. ActivityPub is true server-to-server federation.
Similarities
Rough heuristic: Nostr optimizes for simplicity, portability, and censorship resistance at the cost of moderation and discovery. ActivityPub optimizes for a mature, moderate-able social graph at the cost of complexity and server lock-in.
btw there's a spoiler tag on lemmy that can be useful for this sorta stuff
Oh! Thanks!