Do you know of a succinct description of the mapping between Mastodon concepts (such as "public"/"unlisted"/... sharing modes, or visibility of replies) and ActivityPub activity entries (such as to,cc,bto,bcc,audience fields)? I would like to:
a) understand how various things I could send as a client to a Mastodon server correlate with things that I can do in a typical Mastodon client UI,
b) understand semantics of various Mastodon concepts better.
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@robryk You can always ask @cwebber she (name change since publication but same person) was the main inventor of activitypub. They are usually very friendly and might be willing to point you to your answer or a resource better than I.