The founder of Wikipedia, the online encyclopaedia written by its users, has defied the Chinese government by refusing to bow to censorship of politically sensitive entries.

Jimmy Wales, one of the 100 most influential people in the world according to Time magazine, challenged other internet companies, including Google, to justify their claim that they could do more good than harm by co-operating with Beijing.

Wikipedia, a hugely popular reference tool in the West, has been banned from China since last October. Whereas Google, Microsoft and Yahoo went into the country accepting some restrictions on their online content, Wales believes it must be all or nothing for Wikipedia.