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The way iOS deals with killing apps is different in iOS 6 and iOS 7, so maybe you should not be force closing them at all now. If you do, as I understand it, iOS 7 closes any associated processes that are running in the background and may be used by other applications. In iOS 6 this wasn’t that big of a deal, because the OS would just restart the needed process. In iOS 7, the process will not restart until you restart the app in question, so you can break functionality of apps.