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Scientists move to Bluesky, transitioning away from X and Meta platforms
(www.dailyuw.com)
This is a most excellent place for technology news and articles.
In a word, audience. I'd prefer it if everyone went with Mastodon, but the audience on BlueSky is orders of magnitude bigger. I cross post to both, but only because I don't trust BlueSky not to do exactly what Twitter and Meta have done eventually.