The relationship between crime and social media has become an increasingly important topic in a networked world. However, the use of social media in relation to violent crime is little understood. This unique book, by an expert in the field, addresses this gap by analysing what those involved in homicide do with social media. Using three international cases in which perpetrators confessed to homicide on social media, it investigates the practices of those involved, providing a groundbreaking conceptual framework of use to criminologists. It argues that such confessions convey important insights not only into the individual offender but also the social and cultural context of contemporary homicide.