The Publicity Department of the Communist Party of China (read: China’s Ministry of Truth) is well-known for its successful monitoring and censorship of Chinese media and internet.
China Digital Times, a California-based website managed by a UC Berkeley professor, maintains a list of leaked ‘censorship instructions’ issued by Minitrue. If you spend some time browsing the links, you’ll find recent examples such as “Delete All Content Related to Panama Papers” and “Don’t Hype, Speculate, or Comment on Brexit.” State run newspapers and media outlets that want to survive within China obediently follow Minitrue’s directives. For those companies such as Facebook, Google, or NYT, CNN, the Economist etc., that keep servers outside of China’s sovereign borders, China employs the most effective filtering and censorship apparatus to date. Packets traveling both into and out of the country must pass through routers along the border that constantly filter out keywords related to the June 4th Incident or Ai Wei Wei. At times, entire websites accessible to the rest of the world simply do not load within China’s borders. Here stands the Great Firewall.