Today's cell phones are on us all the time, and they come with hardware that can act as sensors for your
environment. For instance, if Bluetooth is turned on, then the phone can see and be seen by other Bluetooth devices. You can start to make a record of the Bluetooth-enabled devices you encounter throughout the day. Then you can figure out, based on the frequency [with which] you encounter other people's Bluetooth phones, what sort of relationship you have with them.
Public Stiky Notes
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