Let's remember that it doesn't have to be Facebook app to snitch your location to Facebook, they purchased enough apps for data mining to have all angles covered. Plenty of people use private facebook on work phones, and they know a lot of people won't give them access to address book, so they have Whatsapp mining it for them as the app won't work without access to your contacts. But even if you lock your device up to the neck in permissions, Niqolle The Shop Assistant standing at your arms length didn't - so her phone will snitch on you instead. Facebook's
patents stipulate use of everything, from GPS, Wifi, RSM, geo-tag, through low energy bluetooth, RFID, NFC and PAN to an instance where data from either a gyroscope or accelerometer suggests that the subject is moving in a movement pattern similar to that of a source of the second wireless communication. That's right motherlovers, they will try to match you if someone's phone (or other computer device) suggests you are standing, walking, running pattern or ride next to a device submitting data (notes 020 and 021 of the patent). It's not conspiracy theory, it's the proprietary stuff they try to call dibs on.