South Korea tried that several years ago. The outcome was (well, apart from gross restriction of freedom of expression) that every small and large websites wer

South Korea tried that several years ago. The outcome was (well, apart from gross restriction of freedom of expression) that every small and large websites were legally required to ask for people's personal identifying information and store it somewhere. There were several popular incidents where millions of people's information were hacked, and who knows how many incidents were there that wasn't publicized. These days it's safe to assume that the name and Residential Registration Number of pretty much every South Korean is floating somewhere in China. (Well, at least the law is gone now...) Glad that China is following our lead.</sarcasm>