I. The idea of freedom of speech : history, rationales, and concepts -- Mill on the liberty of thought and discussion / Christopher Macleod -- The classic arguments for free speech 1644-1927 / Vincent Blasi -- The truth justification for freedom of speech / William P. Marshall -- Autonomy and free speech / Catriona Mackenzie and Denise Meyerson -- Freedom of expression and democracy / Ashutosh Bhagwat and James Weinstein -- Freedom of speech and human dignity / Dieter Grimm -- Economic perspectives on free speech / Daniel Hemel -- Freedom of speech and public reason / Wojciech Sadurski -- II. Freedom of speech as a legal principle -- What is speech? : the question of coverage / Frederick Schauer -- Proportionality and limitations on freedom of speech / Grégoire Webber -- Freedom of speech in international law / Michael Hamilton -- The structure of a free speech right / Stephen Gardbaum -- Positive free speech : a democratic freedom / Andrew T. Kenyon -- Speaking back / Katharine Gelber -- III. Controversies and contexts -- Defamation law, Sullivan and the shape of free speech / Andrew T. Kenyon -- Privacy and speech / Ioanna Tourkochoriti -- Free speech and elections / Joo-Cheong Tham and K.D. Ewing -- When is speech that causes unlawful conduct protected by freedom of speech? : the case of the First Amendment / Geoffrey R. Stone -- The internet and social media / Gregory P. Magarian -- Parades, picketing, and demonstrations / Timothy Zick -- Insult of public officials / Christoph Bezemek -- Freedom of expression in the workplace / Cynthia Estlund -- Music and art / Mark Tushnet -- Free speech and commercial advertising / Frederick Schauer -- Hate speech / Alon Harel -- Pornography / Caroline West -- Religious speech / Gautam Bhatia -- Glorifying censorship? : anti-terror law, speech and online regulation / Eliza Bechtold and Gavin Phillipson -- Freedom of media / Dieter Grimm.