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The price of free: how Apple, Facebook, Microsoft and Google sell you to advertisers

Here's what popular services like Apple, Google, Facebook, and Microsoft collect -- and what you can do about it.

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    Related:
  • Privacy
  • Microsoft
  • Google
  • Facebook
As PCWorld's senior editor, Mark focuses on Microsoft news and chip technology, among other beats. He has formerly written for PCMag, BYTE, Slashdot, eWEEK, and ReadWrite.

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