Forget big brother tracking you via your phone, anyone with a bone to pick can stalk you via ad supported apps on your phone for around $1000.  Researchers conducted some disturbingly effective experiments where they created a banner which displayed geo-targeted ads and went through the usual process of paying to have it displayed inside an app, in this case Talkatone.  If the app was left open for more than four minutes, or opened twice in that same amount of time, they were able to pinpoint that phones location within 25 feet.  That let them map out a daily route, work and home addresses as well as many of the locations visited by the person bearing the phone.  Read the full article over at Wired and reconsider this the next time you are pondering installing an ad supported app on your phone.

"They then used that DSP to place a geographic grid of location-targeted ad buys around a three-mile square section of Seattle, which for their tests they set to appear on the popular ad-supported calling and texting app Talkatone."

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