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Defederation and comment threads
(mander.xyz)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
That's correct, any thread starting with a Meta comment will disappear from your perspective.
On the other hand, assuming Meta hasn't defederated mander.xyz, Meta users could still see and comment on posts that you made on misguided.ml. You wouldn't see any of their comments, but users of misguided.ml would be able to.
Federation is a bilateral agreement