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.