This groundbreaking book takes a fresh look at Digital Psychological Warfare and explore the exploitation of emerging technologies and corresponding impact on human psychology and behaviour across the globe. The book discusses the psychology of individuals involved from many perspectives including victims of online trolling, digital hate speech, disinformation, Big Tech firms, hackers, and cybercriminals. It explores the motivations of both those carrying out digital psychological warfare and its victims. The books covers lots of case studies to prove how the motivations of those carrying out psychological operations and its victims, coupled with threat vectors can lead to huge impact not just in cybersecurity but to society at large. It discusses the role of psychological vulnerabilities, bias and human factors on them being targeted online. Interviews were conducted with victims of online radicalisation, trolling abuse and digital hate speech to understand motivations and psychology from many perspectives.