Why so many advertisers on Apple’s iOS are still tracking with UDIDThe transition from advertisers, publishers and ad networks using UDIDs to target their ads to Apple's expressly designed-for-them Identifier for Advertisers, is going slowly. The reason? A combination of a bug, bad timing, and a slow-moving industry.
http://feedproxy.google.com/~r/TheAppleBlog/~3/nccE_O3wrmY/story01.htm
