Structured Data & Schema· Topic 04 · Definition
ActivityPub
The W3C protocol the Fediverse runs on. Every post and profile is a typed JSON-LD object with its own web address.
ActivityPub is what lets Mastodon, Lemmy, PeerTube, Pixelfed and Threads talk to each other. Content is published as Activity Streams objects: typed, JSON-LD, and each one addressable at a stable URL. Anything that follows a reference to your content gets structured data with attribution attached rather than scraped HTML. Worth knowing: a server fetches your objects when something already references them, so publishing alone does not put you in anyone's timeline.
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Knowing the term is step one.
Geordy operationalizes every term in this glossary - generating the structured files AI engines actually read.