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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.
Might as well say Instagram isn't social media either, nor is Facebook or Twitter. Social media is just a platform where one of the biggest parts of it is the commenting system. Its a social media platform for content aggregation. The commenting makes it social.
There are tons of "but Lemmy isn't social media because blah blah blah!!!" comments here by the kids who think they are too cool to be lumped in with the instagram / facebook crowd.