I've read reports about that in China, such as depending upon what you post is how you are treated in the country. If you post a lot of negative stuff on the internet, you will be not treated as nice, for example having to wait longer for an appointment in a gov't office (i.e. doctor) , or say building permit or business license. On the other hand, if you post positive, "Pro-China" messages you will get better treatment. I don't know all the details, but it sounds scary.
Even this, the facial recognition is scary. A lot of it is FaceBook's fault. No, it's the users on Facebook. They post a picture and then tag the people by name in the picture.
The series "Black Mirror" on Netflix, is a scary look into the future of technology.
My wife's parents in Bulgaria still need a visa to come here to visit. They've had on in the past, they are good for 10 years. They just renewed it again, and for the first time, the US wants to know what social media they have accounts as part of the background check.