While shopping online often means your whims are creepily tracked, at least theres respite in brick-and-mortar retail, right? Actually, following tests at a New York outlet, Apple has just rolled out iBeacon technology that can shadow your every move in all 254 of its US stores — if you want it to. Thats the same system Macys and Major League Baseball are testing at select locations, which uses Bluetooth frequencies to precisely sense your position.