This book delivers an original, theoretically informed analysis of the legal regulation of online speech. Rejecting the narrow pluralism of elitist and deliberative accounts of the citizen’s role in political discourse, the book defends a participatory account of speech in non-deliberative settings. The latter account of political pluralism best captures the republican democratic aspiration for popular, on-going authorship of the laws and the centrality of freedom to dissent in democratic theory. The legal and policy implications for governments and social media platforms of this inclusive...