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Another new feature in iOS 8 was outed today. While your iPhone is scanning for WiFi networks it uses randomly generated MAC addresses instead of your devices real MAC address.
Recently a number of stores/companies have been using MAC addresses to track unique visitors by recording the MAC address of devices that "visit" their store. Since a MAC is unique, they can get useful data (like how often or when you visit). Using a random MAC address effectively makes this method of tracking obsolete.
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