This book explores the nature of hate speech on social media. Readers will find chapters written by 21 authors from 18 universities or research centers. It includes researchers from 11 countries, prioritizing a diversity of approaches from the Global North and Global South - Brazil, Cyprus, Ethiopia, Germany, Nigeria, Portugal, South Africa, Spain, Switzerland, Turkey, and the USA. The analyses herein involve the realities in an even larger number of countries, given the transnational approach of some of these studies.One can find a preview of the chapters at the beginning of the book, with abstracts organized in a separate section. It is evident that the authors study the impact of recent events on hate speech - the Covid-19 pandemic, Russia- Ukraine war, the refugee crisis - and recurrent attacks on minority groups such as women, immigrants, or the LGBTQ+ community. The authors employ classic and digital research methods, using quantitative and qualitative data gathered from platforms like Telegram, Facebook, Instagram, Twitter, and YouTube. As a result, readers will encounter taxonomic proposals, new methodological approaches, theoretical frameworks, and mapping of behavioral patterns.