EFF Guide to Street Level Surveillance
I would like to see them cover Bluetooth and 802.11-based tracking. Most people I've talked to are unaware that their wifi device periodically sends out probe requests containing its unique MAC address (some more frequently than others, in my testing), which can be used to correlate your location and build a profile.It's not even difficult, I set up a Raspberry Pi to do it and graphed the arrival and departure times of individual workers in my office. There are businesses putting tracking across a constellation of retail partners, then selling the partners information about what other stores their customers visited.And yes, I'm aware that iOS 8 is supposed to randomize your MAC address to guard against this (cynically I'd say it helps them push iBeacons) but as of September 2014, it wasn't really working as you'd expect: http://www.imore.com/closer-look-ios-8s-mac-randomization