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It's not just you โ no one is posting on social media anymore
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It's standard practice for Facebook and it's been for several years now. It's simultaneously a way to combat bots and a way to start collecting data about you in case you turn out to be a juicy real human. They want your pic and your contacts so they can start establishing your real identity and recognize you in pictures posted by others. If you don't help them do that you're worthless to them so they block you.