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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.
Mastadon has definitely improved it's user onboarding process. When I first tried, and failed, to use it 3 years ago it was awful. Signing up a year ago was a painless process. It may not be fully ready for the mainstream just yet, but it's definitely getting there.