Why wont the facebook icon on my iphone show up?

I downloaded facebook on my iphone 4s, it says "installed" and everything, but an app icon never appeared for it. When i go to the app store, next to the facebook app it just says "OPEN" so i cant re-install it and the only place i can access it. Can someone tell me how to make the icon show up please? Thanks

Did you Publish your Changes Made in your Itunes on your Computer if not Please Do So After you have Done That It Should Show up