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Help Back button opening last closed app

That's pretty much the way that back works. It usually is supposed to back it's way through all of the steps that you've taken, both within in app and going from app to app. There are very few apps that actually have a close option - apps are just generally put in a background state when you press home or back to leave them, or open an app from a notification, etc. I'm not sure why Facebook would close after it opens, unless it's registering another back button press.
 
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