As we consider the opportunities and challenges around open knowledge on the web, I find it interesting to consider situation antithetical to such openness such as China. This blog highlights some of the words and phrases that have been blocked by the Chinese government on Weibo, the Chinese equivalent of Twitter, along with possible explanation for why they may have been blocked. The Chinese government employs over 2 million workers to monitor the internet in China. (http://www.bbc.com/news/world-asia-china-24396957)