The document describes a study that developed the Facebook Addiction Susceptibility Test (FAST), a paper and pencil self-administered test to measure susceptibility to addiction of online social networking sites among late adolescents. The study administered questionnaires to subjects in Manila that included scales measuring internet addiction and the FAST projective test using Facebook icons. Scores on the FAST and other tests were analyzed to establish the validity and reliability of the FAST as a tool for measuring susceptibility specifically to Facebook addiction.