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A question I keep asking myself with both Mastodon/ActivityPub and BlueSky is "What is the minimum viable server you need to participate in this?"

Do you *have* to have a database server? Does it have to be a big beast like mysql/postgres or for a one-user "instance" can it just be a sqlite file?

Do you *have* to have server "software" running, or can you get by by serving static files off a (say) https server?

Do the answers to the above change if you don't care about receiving "replies"?