Maybe you saw it in a creepy episode of Black Mirror called "Nosedive." Perhaps you remember it from a hilarious episode of Community called "App Development and Condiments." It's also appeared in various novel and comic book plots. It's the idea that everyone can (or must) use an app to rate anything and everyone - then those rating scores are used to limit your access to real-word privileges.
Someone doesn't like your clothes? Sorry, that's a deduction. You got into a heated political argument with a friend? Well, they just downvoted you. Didn't leave a big enough tip? Oops...your waitress just left a review that cost you a few points. Those with higher ratings will now enjoy benefits you will not. You'll be denied service, your access to society will be limited, and you will be shunned by your betters. Have a nice day.