Google knows where you are at all times.

Google knows where you are at all times if you give them your cell phone number. If you allow them, they will let other people track where you are too.  

Read more here: 

http://www.cbsnews.com/stories/2009/02/04/earlyshow/leisure/gamesgadgetsgizmos/main4774320.shtml?tag=topHome;topStories

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