At a party, it's sometimes permissible for serving personnel to
a. smoke, provided they don't do so in view of the guests.
b. become part of the party if they know some of the guests.
c. take home any leftovers that remain.
d. sample the buffet items before the guests arrive.

According to the article,"social credit" is question 3 options: an experiment to people talk on-line a farming experiment that hurt people under mao ze dong using someone else's data from the internet, to give or take away things such as the right to buy an airline ticket a credit you get in china for having friends in real life, and not just on social media