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President Biden is now posting into the fediverse
(www.theverge.com)
This is a most excellent place for technology news and articles.
Threads is not the fediverse
You're right. But, the Fediverse is ActivityPub, and Threads is using ActivityPub, therefore Threads is part of the Fediverse.
The beauty of the Fediverse is you can defederate from whoever you want. But don't confuse that with thinking that you can change the definition and rules of what the Fediverse is.