Abusive posts on social media target women engaged in online conversation with words and images that affirm patriarchal ideologies and fixed gender identities, to maintain cyberspace as a man's world. This book investigates online misogyny as a pervasive yet little-researched form of hate speech. By focusing on six cases of cyber harassment directed at women in Australia, Italy, and the United States, this qualitative analysis reveals specific discursive strategies along with patterns of escalation and mobbing that often intertwine gender-based harassment with racism, homotransphobia, xenophobia, and ageism. The author provides a taxonomy of negative impacts on targets that integrates findings across cases and indicates pathways from hate speech to harms. The study suggests an urgent need for effective measures against the threat posed by misogynistic hate speech to individuals and to an open, respectful forum for online communication.