When you think of the Chinese economy you probably conjure up images of assembly plants and production lines, but those old stereotypes need updating. 650 million Chinese citizens use the internet and as that number increases so does the business potential of the world wide web. But of course the internet brings with it social, cultural and political change too and that is where China's rulers begin to get nervous. HARDtalk speaks to one of the new breed of Chinese tech entrepreneurs, Charles Zhang, CEO of Sohu.com. Can the Chinese government impose its will on the web?