Even in Chinese, “911” is shorthand for September 11 and the events that transpired 11 years ago today. Web users in China have taken to social media to mark the anniversary, some waxing philosophical about the passage of time and the elusiveness of world peace, others repeating the claim, often heard here, that the world’s largest terrorist organization was, in fact, the United States. The tension between those in China wishing to commemorate the tragic attacks on the U.S., and those suspicious of offering America even the slightest sympathy, are a reminder of the wariness many Chinese feel about American power.