Hi there and welcome
What is the make and model of the device you are using the Facebook app on?
Please let me know
Swipe in from the right side of the screen and tap 'All settings.' Select System and then tap Apps & features. You can sort the list of apps by size, name, or install date select it from the list and then tap or click the uninstall button
Then restart the Surface Pro, install the app again and tell me if it now functions please.