Can anyone with a little more knowledge about either iBeacons or WiFi MAC Address triangulation explain how active or passive one needs to be in order to participate or opt-out of such activities? From what I understand, the iBeacons can only interact with your phone if you have a specific app installed, e.g., if you have the 49ers app installed on your phone and you have Bluetooth enabled, it listens in the background for iBeacon broadcasts and might show you the corresponding push notification that it has downloaded when you get within range of iBeacon x. At the same time, the venue can determine your location accurately down to the spacing of the beacons. What happens if you have Bluetooth enabled (but not visible) but not a venue sponsored app? Are iBeacons (or similar Bluetooth beacons) capable of mapping these users? I presume that no push notifications could occur in this case.<p>As for WiFi triangulation, my limited understanding is that it relies on users walking around with WiFi kept on. Can push notifications occur even if the user doesn't connect to the venue's WiFi but has a sponsored app? Is a phone's active search for familiar SSIDs enough for venue hotspots to observe the movement of MAC addresses/phones? What about a phone without a sponsored app and WiFi enabled but not connected? (I think this is the 'sunsetted' tech mentioned in the article.)<p>Thanks.