Summary of Nancy Jo Sales's American Girls, is the result of a two-and-a-half-year investigation into how social media is shaping the development of girls in America today and, by extension, what this means for fostering self-esteem and self-respect. Sales interviewed more than 200 subjects, girls ranging from 13 to 19 years old, querying them on the new social norms that have been set by the explosion of social media over the last five years and how this plays out in their daily lives.