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. As the Chinese internet grows and online businesses thrive, speech is controlled, dissent quashed, and attempts to organize outside the official Communist Party are quickly stamped out. James Griffiths shows just how far the Great Firewall has spread.

Protests : solidarity from Hong Kong to Tiananmen --Over the wall : China's first email and the rise of the online censor -- Nailing the jello : Chinese democracy and the Great Firewall -- Enemy at the gates : how fear of Falun Gong boosted the Firewall -- Searching for an opening : Google, Yahoo and Silicon Valley's moral failing in China -- Along came a spider : Lu Wei reins in the Chinese internet -- Peak traffic : Getting the Dalai Lama online -- Filtered : The firewall catches up with Da Cankao -- Jumping the wall : FreeGate, UltraSurf, and Falun Gong's fight against the censors -- Called to account : Silicon Valley's reckoning on Capitol Hill -- Uyghurs online : Ilham Tohti and the birth of the Uyghur internet -- Shutdown : how to take 20 million people offline -- Ghosts in the machine : Chinese hackers expand the Firewall's reach -- NoGuGe : the ignominious end of Google China -- The social network : Weibo and the last free-speech platform -- Gorillas in the mist : exposing China's hackers to the world -- Caught : the death of the Uyghur internet -- Key opinion leader : how Chinese trolls go after dissidents overseas -- Root and stem : the internet is more vulnerable than you think -- The censor at the UN : China's undermining of global internet freedoms -- Sovereignty : when Xi Jinping came for the internet -- Friends in Moscow : the Great Firewall goes west -- Plane crash : China helps Russia bring Telegram to heel -- One app to rule them all : how WeChat opened up new frontiers of surveillance and censorship -- Buttocks : Uganda's internet blackouts follow Beijing's lead.