Do you consider your personal information well protected? You use different passwords for different accounts, keep your social network activity private, even fake your profile on social media. Your efforts are probably in vain.

Everything you have done is under surveillance and your life pattern can even be figured out by people who are thousands of millions away from you. The government knows that you called Daisy three times in twenty-four hours, with one after midnight. You use Google Map in Central, Hong Kong at 2pm and your route is also recorded. You may wonder: I am just nobody. Why will somebody spare effort to analyze my data? In fact, you are somebody. Three degrees of separation points out that if you have 190 friends on Facebook, then after “three hops”, the network you can reach is even bigger than the population of Colorado.

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