Apple Introduces Advertising Identifier to Replace UDID
Apple has shared some more information about its new Advertising Identifier which will be used to replace the UDID (unique device identifier) in iOS 6.
iOS 6 introduces the Advertising Identifier, a non-permanent, non-personal, device identifier, that advertising networks will use to give you more control over advertisers' ability to use tracking methods. If you choose to limit ad tracking, advertising networks using the Advertising Identifier may no longer gather information to serve you targeted ads. In the future all advertising networks will be required to use the Advertising Identifier. However, until advertising networks transition to using the Advertising Identifier you may still receive targeted ads from other networks.
Recently, AntiSec leaked 1,000,001 Apple Device UDIDs from a file of over 12 million reportedly obtained from the FBI. Apple has denied providing them to the FBI and the FBI has denied having them. It appears they may have been stolen from Bluetoad, an App Store App Publishing company.