Note from Artem: Mark Murphy, also known as CommonsWare and CommonsGuy, is one of the top 10 contributors to StackOverflow (he's currently #8). He's the Chuck Norris of Android development, with over 300,000 StackOverflow reputation points. I am honored by his decision to accept my offer to join the AndroidPolice team of contributors.

The User Defense series of posts will highlight relatively easy ways in which users can improve the privacy and security of their use of Android devices.

People sometimes worry about so-called "tracking cookies" that allow marketers to effectively spy on their Web surfing. Your smartphone is more or less a tracking cookie for the physical world, with everything from shopping malls to recycling bins tracking your movements.

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