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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.
Agreed on spying, though I don't think it's any worse than posting on public sites.
The new people concern cuts both ways. Yes, it's moderately harder for brand new folks to learn about them and gain access. But it's far from impossible, and the additional hurdle or effort tends to substantially cut down on trolls, spammers, etc.