Bluetooth is a short-range wireless communications protocol that doesnt deserve its uncool reputation. It can be used to send contacts or videos to someone, tether devices, talk to people safely while in a car, or even just fire up some wire-free headphones in the gym without hassle. But security concerns about Bluetooth are being raised today in the realm of beacon technology. We’re exploring the kind of beacon located in a store you happen to enter, or just pass by inside a mall, which sees you coming and helps to serve up (say) some targeted advertising on a billboard.”]