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Re:Facebook's AI Points Internet Drones to Where the People Are by cryptoz on Monday February 22, 2016 @01:02PM (#11152812)
Doesn't really matter if he connected to the WiFi: even just having WiFi enabled/turned on means that you should assume every store that you enter knows that you're there, and every other retail store also knows (that you're inside a competitor's store).

There are a number of startups providing these services (some of them have gone through YC I think?). It's now so common that you just have to assume that if your phone is broadcasting anything at all, including looking for a WiFi network to join, that your location is being tracked and sold for competitive analysis by corporations.

Re:Facebook's AI Points Internet Drones to Where the People Are by datagram on Monday February 22, 2016 @05:25PM (#11154812)
Unless there's techniques I'm unaware of, I assume you're talking about MAC address-based tracking? Apple has been working to eliminate that; they've been using randomized addresses during scanning since iOS 8.

The other possibility here is tracking via geolocation or iBeacon, which require an app with location services/bluetooth enabled. And in those cases the tracking is most likely based on Apple IDFA/Google Advertising Id, so you at least have the option to opt out: https://dev.twitter.com/mopub/ui/opting-out-interest-based-a... (assuming the app properly respects the setting).

Re:Facebook's AI Points Internet Drones to Where the People Are by graeme on Monday February 22, 2016 @02:47PM (#11153693)
How much does airplane mode affect this? I have it turned on constantly when I'm out. Mostly to avoid distractions.
Re:Facebook's AI Points Internet Drones to Where the People Are by johnchristopher on Monday February 22, 2016 @03:14PM (#11153911)
Do we know for sure it's working: does that information lead to more sales ?
Re:Facebook's AI Points Internet Drones to Where the People Are by datagram on Monday February 22, 2016 @05:21PM (#11154787)
It's generally understood that it's quite effective to advertise to prior customers compared to say, targeting a geographic area.

Apparently it's about as effective as search ads: http://venturebeat.com/2014/12/16/90-of-marketers-say-retarg...

Re:Facebook's AI Points Internet Drones to Where the People Are by bogus- on Monday February 22, 2016 @01:17PM (#11152960)
Yes, this is made possible by WiFi probe requests, which broadcast your MAC address and previously associated access points.