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The instances blocking Zuckerberg's Threads.net
(fedipact.veganism.social)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
On kbin/mbin you can look at https:///federation it has a list of known instances and right at the end is the list of defederated ones.