I've got notifications turned on for Facebook messages. The banner shows up on my home screen, and it plays a tone. The tone is quiet and short. It is the tone that plays when I am on Facebook from my computer and a message comes in as I sit there. It is too quiet and short for my taste for my iPhone 5C running iOS 7.03. I cannot find a way to customize this tone. I can find a way to change the Tweet sound. I can find a way to change the Facebook post sound. I cannot find a way to change the Facebook notification sound. Can you?