How to fix download notifications? From what it looks like, Facebook is just downloading an update, but it is not downloading anything. Even after multiple reboots and uninstalling Facebook app, it still continues. How to clear this up?

Phone is Samsung Galaxy S3 running Android 4.1.2. With default TuchWiz launcher.
Try: 
-Long pressing the notification. 
-A small dialog that says "App Info" will appear. 
-Press "App Info" 
-Press "Force Stop".