TECH

Data Mining: How Companies Know Your Personal Information

03/10/2011 12:24 pm ET | Updated May 25, 2011

Each of these pieces of information (and misinformation) about me is sold for about two-fifths of a cent to advertisers, which then deliver me an Internet ad, send me a catalog or mail me a credit-card offer. This data is collected in lots of ways, such as tracking devices (like cookies) on websites that allow a company to identify you as you travel around the Web and apps you download on your cell that look at your contact list and location. You know how everything has seemed free for the past few years? It wasn't. It's just that no one told you that instead of using money, you were paying with your personal information.

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