Once little more than a glorified porn filter, China’s ‘Great Firewall’ has evolved into the most sophisticated system of online censorship in the world. Even as the Chinese internet grows and online businesses thrive, speech is controlled, dissent quashed, and any attempts to organise outside the official Communist Party are quickly stamped out. But the effects of the Great Firewall are not confined to China itself. More and more, China is threatening global internet freedoms as it seeks to shore up its censorship regime, with methods that are providing inspiration for aspiring autocrats the world over. As censorship, distortion and fake news gain traction around the world, and internet giants such as Facebook show ever greater willingness to compromise internet freedoms in pursuit of the Chinese market, James Griffiths takes a look inside the Great Firewall and explores just how far it has spread, arguing that its influence can only be countered by initiating a radical new vision of online liberty.