This book focuses on the ubiquitous and powerful effects of ostracism, social exclusion, rejection, and bullying. Human beings are an intrinsically gregarious species. Most of our evolutionary success is no doubt due to our highly developed ability to cooperate and interact with each other. It is thus not surprising that instances of interpersonal rejection and social exclusion would have an enormously detrimental impact on the individual. Until 10 years ago, however, social psychology regarded ostracism, rejection and social exclusion as merely outcomes to be avoided, but we knew very little about their antecedents and consequences, and about the processes involved when they occurred. Furthermore, the literatures of ostracism, social exclusion and rejection have not until now included discussions of the bullying literature.