2023-05-04 UTC
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[0x3b0b] Some AP server implementations support a "local only" publishing option that prevents the post from federating, so on top of whatever visibility you set, it is only sent to your account's instance; and (on all such implementations I know of) it is also only visible to logged-in users of that instance, even if public - can't recall whether someone else can then boost it over the wall if they want, but most instances that use the feature
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