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Although this "know you very well" big data has brought a lot of convenience to our lives, the hidden dangers are also worrying, such as information security. Therefore, in this era of big data, while enjoying "intimate" services, we should also pay attention to their information security, just in case.

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The Japanese police, for example, have seen a tweet from someone announcing a random killing at Tokyo station, with the warning saying "ten people will be killed". The Tokyo Metropolitan Police had been tightening security around JR Tokyo station since the night before and had begun investigating the source of the information.

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Someone may use your social media to spy on you, or even follow you in real life. The name, phone number and address you use to sign up for Facebook, your birthday, YOUR ID number, your list of friends, and your hobbies and interests when you sign up for Twitter. When you send status, location markers or iconic buildings in the background of the image. These various pieces of information are aggregated on the web to create a complete and concrete image of you. It contains a vast amount of information about you.

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Big data will help to deal with crises and make decisions on time through the use of social media. For example, Twitcident was a tool used by professionals in emergency control rooms to track data posted by citizens on Twitter to maintain the security of the urban environment (Boersma et al. 2016)

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First of all, your browsing history, click times, hobbies and habits on the Internet and various software are all objects of big data mining by big companies. Based on big data analysis, it can locate your geographical location, analyze your daily consumption habits, and accurately push delivery information for you. It can even monitor where you are at this time of day, whether you are out of the building, your radius of movement, to a meter level of accuracy.

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These data are based on the purchase records, retrieval records and communication records of people on the Internet, and these records are the portraits of each of us in the environment of the Internet. In reality, these records may only be hidden in our minds, but exposed in the face of big data.

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There was a time when I used DIDI to take a taxi to a place for a class, and I went to the same place at the same time for ten days in a row. Until the end of my course, I don't need to take a taxi anymore. This software will send me taxi information a few minutes before the class is supposed to start. "The road section to XXX is in good condition, and the driving time is about ten minutes.

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The information sent by personal data statistics makes it easier for people to get satisfied. The goods they want to buy, the things they care about and the habits they read will be directly presented.

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Personal information is also vulnerable to snooping, especially now that big data is so useful in applications as diverse as Google, Amazon, Facebook, Microsoft and Oracle -- almost all of the leading companies have started developing big data.

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While we enjoy the convenience of life, we also expose our privacy.