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It's not just you — no one is posting on social media anymore
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I would argue that the quality of content is in decline more than numerical users. Also, the quantity of ads are much much higher, which hides what little good content there is.
Mix that in with political splits in social media sites (from left leaning Lemmy to the Facebook right), and you generally find yourself in an echo chamber with little to surprise you, and a lot of things confirming what you already know.