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Political candidates are learning a lot about you -- thanks to your phone tracking you

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Holding an iPhone. Credit: Matt Madd/CC BY 2.0.

It should come as no surprise that your phone is tracking you when you’re shopping online. But now you can be tracked based on where you go in the real world, like a political rally. Political campaigns are using this kind of technology -- called digital fencing -- to send targeted ads to potential voters for months after the fact.