What it is? It's high school and teens. I just don't recognize much of it. Supposedly the social life is centered around cliques, there is murdery social backstabbing, using drugs is not normal but happens with some regularity. People participate in clubs to get them sweet achievements to get admitted to a prestigious college. There's apparently a big emphasis on rote learning and history is politicized in a straightforward way and sanitized. And apparently people, online at least, still feel viscerally about their high school days. To me they were pretty sweet if mellow times that have been superseded by better things.
I just don't get the whole things. And there seems to be a whole deal of fatalism about it as well. The explanations given seem to revolve around brains and hormones and other biotruths, which have some degree of truth to them, but can't explain why things differ here in Finland and in America, or at least they are perceived to. We never had cliques, just some groups that were bonded somewhat more strongly. I hanged out with most folks in my free time. People floated being closer and more distant.
There was mostly no clubs or hobbies after school or during school hours or whatever. I did take the drama class three times and played a lead role in a play that was a disaster, but I wasn't a drama kid. I suppose it might not in actuality be that different, but I see things like "drama kid" being talked pretty often online, taken as a significant category in not so terribly significant circles of high schools.