We play as kids in school. We're pretty young, and what matters most is to be one of the Cool Kids. We all pretty much watch the same shows, go to the same shops and like the same things except this changes dramatically from day to day. If you don't get the memo about what's hot or not, we'll make fun of you.
There's no book telling you what to like and what to dis. It's still all on the test. And the test is happening every day.