iOS 7 user tracking

iOS Dev Weekly, issue 108:

If your solution to having uniqueIdentifier deprecated was to use the MAC address of the device in some way then you're going to have a bad time in iOS 7.

[…]

The message here is very clear, Apple are not afraid to remove any API that makes tracking users across apps by different vendors possible.

Apple:

If your apps use the MAC address to identify an iOS device, the system will return the same static value for all devices running iOS 7.

It is a bad week for advertisers (see: Google Play new policies).