Recently, it has been reported that, with iOS 6, Apple has a new tracking mechanism built-in that allows targeted advertising. Basically, this just means that when there are ads in apps, that they can display ads that Apple feels will be more relevant to you, rather than having them be completely random. Some users don't appreciate any sort of behavior tracking, and would rather turn this feature off. One easy way to get to this setting is to visit the following address from your iOS device: http://oo.apple.com. That will redirect you to the opt out panel for Interest Based iAds. Turn the setting to OFF to disable the feature, and you'll no longer see ads that are targeted to your interests.