Imagine if everything you did on Facebook or Twitter counted towards a government-imposed 'citizen score'.
All your online behaviour would be analysed and assessed to come up with a measure of your online reputation, character and trustworthiness.
This could then be used by employers to decide whether to offer you a job, by banks to decide whether to give you a loan, or even by prospective partners.
Well, China is planning something like this called the Social Credit System. Details are sketchy at this stage but it is due to be up and running by 2020.