A Greek friend of mine who applied for a visa to do a PhD in US about a month ago, was required to unlock their social media profile by the US embassy, this is already happening.
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Weird that people somehow are making more fuss about showing your social media to authorities than giving away your biometrics.
I'm afraid we're going into a weird timeline where authoritarian figures in power(not just government) are having immense amounts of data for people, and the technology to go through it without much effort. It's a good time(if it's not to late) for everyone who cares about their privacy to start getting as much as possible outside mainstream social media and centralized accounts(google etc)