Gossip Girl (series), by Cecily Von Ziegesar
Reasons: drugs; offensive language; sexually explicit
The series revolves around the lives and romances of the privileged teenagers at the Constance Billard School for Girls, an elite private school in New York City‘s Upper East Side. The books primarily focus on best friends Blair Waldorf and Serena van der Woodsen, whose experiences are among those chronicled by the eponymous gossip blogger. The novel series is based on von Ziegesar’s experiences at Nightingale-Bamford School and on what she heard from friends.