"Big Box Brother: While You Shop the Mall, the Mall Shops You. From Black Friday though to the end of the December, two malls in southern California and Richmond, Va., will be following shoppers by tracking their cell phone signals. When somebody walks out of the Gap, into the Starbucks, out through the Nordstrom and on to the Auntie Annes pretzel stand, the mall will be monitoring." - from here.
It what we wrote in SpotEx by the way :-)