This edited book offers insight into the linguistic construction of prejudice and discrimination in social media. Drawing on the outputs of a three-year research project, NETLANG, involving scholars from five European countries (Portugal, Czech Republic, Estonia, Finland and Poland), as well as on external contributions from participants in the project's final conference, the collection brings together a variety of linguistic approaches to the study of online hate speech, ranging from pragmatic to syntactic, morphological, and lexical analyses, with a considerable focus on Natural Language Processing and Corpus Linguistics. Data from English, Portuguese, Danish, Lithuanian, Persian, Polish, and Slovenian are examined, along with various geopolitical contexts for hate speech, especially anti-refugee and anti-immigrant discourse. The authors explore a continuum of overt to covert textual data, namely: (i) structural elements, such as syntactic and morphological patterns which recur throughout the texts; (ii) lexical and stylistic elements, revealing the often implicit ways in which vocabulary choices and rhetorical devices signal the expression of hate; and (iii) interactional elements, concerning the pragmatic relationships established in online communicative exchanges. The chapters cover numerous types of prejudice, such as sexism, racism, nationalism, antisemitism, religious intolerance, ageism, and homo/transphobia. The book will be of interest to an academic readership in Linguistics, Media Studies, Communication Studies, and Social Sciences.