Ad Networks Bypass iPhone Privacy Rules
Wall Street Journal
Mobile ad networks are using new techniques to target iPhone users by circumventing Apple Inc.’s AAPL -0.26%earlier efforts to protect user privacy. Apple last summer said it would stop allowing app makers to use a unique identifier embedded in iPhones and iPads to track users as they move from app to app, which is an important way for advertisers to position their ads for appropriate audiences. To avoid the limits of Apple’s rules, ad networks that serve advertisements within mobile apps have started using new identifiers that collect information like location and preferences as the user moves across apps.