There's a theory out there that posits a giant "feedback loop" between MTV and other purveyors of youth culture and the kids who consume it. Shows like "Skins" actually do hold up a mirror to a portion of their audience.
These books that deal with anorexia, cyber-bullying, self-mutilation, alcoholic parents, and vampiric sex strike a nerve with teenagers because of the intense developmental and social changes they're experiencing.
My boys did not grow up on a farm. This might not be an issue if 99 percent of their early reading did not consist of stories that featured owls, bears, cows, kangaroos, bats, pigs and little red hens.