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Bluesky has gained a million new users in the last three days.
(www.theverge.com)
This is a most excellent place for technology news and articles.
As far as I understand, the protocol and client apps are completely open souce. I do not believe the Bluesky software is open source, so you could not host an instance the same way you would with Mastodon. I could be missing something or not underatanding, but that's what it seems to me.