I lost the fb app on my iPhone

I can't find it on my iPhone it's literally gone and when I go to the app store i can't downloaded it because it says it's installed what do I do? I hate having to go on google because it's much slower than the mobile app version!

Uninstall on the app store then re install if that doesn't work then i have no clue.

Try turning off your phone by holding down the power button then wait 5 min. If that doesn't work then on the home screen go to the page to the left of it and type in facebook to see if it shows up.

Simple.go to Spotlight search and type in Facebook.

Maybe you accidentally hid it or put it in a folder? Go into itunes and fix it or reboot your phone.