what do you mean by "big data" if you are referring to big tech, then it has a massive impact on privacy and security, as the vast majority of your personal information, including phone number, name, address, geographic locations, and much more are stored by big tech companies. and this information is used typically for targeted advertisement. however, if you find yourself being wanted by the government, the authorities in your area can usually subpoena that tech company for your information. this is why its crucial to use a VPN service or best yet... use TOR.
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