Technically, all the messages castling.club itself generates are all public, but the rest of the thread can be private depending on user settings. One thing th

Technically, all the messages castling.club itself generates are all public, but the rest of the thread can be private depending on user settings. One thing that's kind of cool: Each message and game detail page can also be requested as JSON using the Accept header. For messages, ActivityPub actually requires this. But for castling.club, these documents also include SAN and FEN for the chess moves and board states. And there's a JSON-LD vocabulary to describe it: https://castling.club/ns/chess/v0 https://castling.club/ns/chess/v0 That's a very technical advantage, I suppose. And how beneficial that is in practice (outside chess) remains to be seen. :)