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Threads’ fediverse beta opens to share your posts on Mastodon, too
(www.theverge.com)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
There's also some sort of soft blocking option, which largely hides the instance AIUI but still gives the ability to follow users. This seems like a better option rather than completely defederating.
If Meta want to scrape your data they can do that anyway. All defederation does is stops you looking at their stuff (which, as you say, can be blocked at the user level anyway)