1. Risks associated with data collection: In the big data environment, information about users, such as interests and daily life, can be accessed through their web site search history, cell phone Internet history, Taobao shopping history, and other information.

2. Many security holes and high risk of data leakage: Some large companies have more security holes, and these companies may also have irregular use of user data, and their security protocols are too lax.

3, in the data analysis and mining, may analyze the user's private information, anonymity will no longer be useful: in the analysis and mining of valuable information, there is a high probability that the user's private information will be analyzed, not only is there a risk of privacy leakage, but also may lead to the failure of privacy protection methods, such as anonymity.