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by cmrdporcupine 1323 days ago
I am not fully clear on how threads are handled, but, yes, in principle visibility of users and posts is based on who they choose to federate with. So C would not see any content that originated out of B. Which AFAIK includes replies, etc.

I'm a Mastodon newb and not an expert, I'm sure someone else more informed could give a better explanation of the subtleties.