Android's Privacy Game-Changer - Businessweek

Fine-grained app permission control, for Android >= 4.3 users who elect to use the new "hidden" feature (and who use apps that support the fine-grained options)

"By way of example, App Ops lets the user turn off various pieces of functionality in the Facebook (FB) app, such as location or the app’s ability to tap into the user’s phone contacts. It also informs the user when the app last deployed specific functions—a handy way of finding out what’s causing all that battery drainage. It’s all pretty buried, although some enterprising soul has already created an app to allow straightforward access to the feature."

Android's Privacy Game-Changer - Businessweek