Drawing on his book Speech Police: The Global Struggle to Govern the Internet and his time as the UN Special Rapporteur on the promotion and protection of the right to freedom of opinion and expression Freedom of Expression, David Kaye has a unique perspective on how states and tech companies are navigating a key puzzle of our time: how to reduce harmful content online and its contribution to extremism and polarisation, challenge the spread of authoritarianism, work around the business imperatives of tech companies, while upholding freedom of expression and human rights.