One AG trying != it happened.
> and social scores are just as possible to implement in the US as in China
Not under the current laws, no.
> we already know that a form of such scoring has already been applied to those thought to perhaps be "terrorists".
No, there is no “terrorist” score that comes up based on posting tweets about how much you hate the US government when you go to apply for a job. In fact, it would probably be worse for your job prospects in the tech industry if you had public posts supporting the current admin.
As to the terrorist score, you are right. That would be too simple to target.
Instead, we have amalgam of various private entities collecting information and selling it to highest bidder. At best, the score is distributed.
Indeed. The closest you get is the No Fly List.