A surprisingly large number of countries exercise at least some control over what content their citizens can and cannot access on the Internet. In many cases, this means very selective blocking of information considered to be harmful, but a handful of countries have developed much more powerful tools to regulate Internet access for political and social reasons. I’m planning to write a few articles about Internet censorship, starting with a look at the country that didn’t just build the great wall to keep outsiders out – it also build the Great Firewall. We’ll start in China!