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Threads is officially starting to test ActivityPub integration
(www.theverge.com)
This is a most excellent place for technology news and articles.
I'm also worried that due to content moderation policies, Threads might choose to federate only with a few handpicked mastodon instances. Thus provoking a huge increase of users in these instances because they want to interact with people on threads and causing a centralisation issue, because people will start joining this instances far more than the others.
It would also render useless self hosting a single user instance for yourself.