The Secret Rites of Social Butterflies — Lizabeth Zindel

When Maggie starts her senior year of high school at ritzy all-girls Berkley Prep, she hopes to make a few new friends and reinvent herself as a popular girl. Then she's tapped to become a member of the most powerful clique at Berkley, the Revelers. Sure, the Revelers know how to have a good time, but they're deadly serious when it comes to their social cause: collecting the secrets of today's teenagers. At first Maggie is seduced by her new friends' wealth and passion for truth. But when the Revelers start using what they know about others for their own benefit, she starts having second thoughts. Especially when Maggie herself is put at risk...