China has the second largest number of internet users in the world. Internet cafes are so popular in China that many stay open 24 hours a day.

Though China's Internet filtering efforts remain largely opaque, it is generating enough jobs. China does employ 30,000 Internet police who monitor Web users in China.

Security guards sits in a back room of an internet cafe watching on closed-circuit TV screens that are linked to a nearby police station. Guards also walk the lines of computer consoles, looking over shoulders to make sure no one slips through firewalls to look at pornography or other banned content.

While college students in China are playing online games at an Internet cafe, every keystroke and website they visit is recorded. All online activities are fed into a nationwide surveillance system used to block thousands of websites and track down anyone posting material that offends government authorities.

All data collected through use of the software are instantly transmitted to the police.

How China Blocks Websites

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Source: USA Today: Great Firewall of China