Won't close how? Like they are running in the background won't close or like they won't leave the screen won't close? Is it eating up your data, memory, battery? Why do you want them to close?
I'm not 100% about the other two but FB stays running in the background when opened so you can get all of those vital updates about your friend's status or that post you commented on. It never really closes. I'm guessing that WWF is probably the same way since it constantly wants you to play as soon as your friends play their round. Not sure why GPM would be like that unless it just wants to be ready with tunes for you at a moments notice. I think you can control the refresh rate on FB so it's not syncing so often, not sure about WWF, and again I have no idea why GPM would be up after closing at all.
You can clear them from your multitasking screen which essentially closes them. The only way to completely stop them is in your app manager by force stopping them, and even at that they may restart on their own.