This book explores the social forces among and between online aggressors that affect the expression and perpetration of online hate. Its chapters illustrate how patterns of interactive social behavior reinforce, magnify, or modify this expression. It also considers the characteristics of social media that facilitate social interactions that promote hate and facilitate relationships among haters. Bringing together a range of international experts and covering an array of themes, including woman abuse, antisemitism, pornography, radicalization, and extreme political youth movements, this book examines the specific social factors and processes that facilitate these forms of hate and proposes new approaches for explaining them. Cutting-edge, interdisciplinary, and authoritative, this book will be of interest to sociologists, criminologists, and scholars of media, communication, and computational social science alike, as well as those engaged with hate crime, hate speech, social media, and online social networks.