How to reinstall Facebook onto my iPhone?

Ok I had uninstalled/removed/whatever my facebook from my phone. How do I reinstall it? When I go to my menu, the FB app is still on there. But I have no idea how to reactivate it.

I want to get pictures from my phone onto the internet.No, I can't text them due to service out here. And since Tmobile took away the MyAlbum online option, how do I get the pics onto the net?

Thank you

Added (1). How do I do that though? I don't see an option for it.

Download the Facebook app again.

You have to go into your app store and type in Facebook in the search bar and click download.

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