mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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Chris Trottier

engineer Jake Gold confirmed to me that a PDS can opt out of BGS indexing.

Which also tells me that AT protocol (and Bluesky) will allow defederation.

So there you have it, @gruber.

If you use AT protocol, you will be able to defederate from other servers for both petulant and non-petulant reasons.

@fediversenews