What China's online censorship systems block

THE April 6th edition of The Economist contains a special report on China and the internet. It contains lots of interesting charts and tables, but the one below, which tries to capture what it is that China's censors delete or block, stands out. Though official data on the operation of China's two state-run online censorship systems, the Great Firewall and Golden Shield, are unavailable for obvious reasons, various studies have been conducted to infer how many people are hitting the delete keys by measuring how quickly sensitive material disappears from sites. This method suggests, for instance, that Sina Weibo (China's equivalent of Twitter) alone employs 4,000 censors. You can read the full report here.

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