There are a few reasons why Facebook might keep closing on your iPad.
Your iPad may not have enough storage space. Facebook requires a certain amount of storage space to run properly. If your iPad is full, Facebook may close in order to free up space.
Your iPad may be running out of memory. Facebook also requires a certain amount of memory to run properly. If your iPad is low on memory, Facebook may close in order to free up memory.
You may be using an outdated version of Facebook. Facebook is constantly releasing new updates that fix bugs and improve performance. If you’re not using the latest version of Facebook, you may experience problems, such as Facebook closing unexpectedly.
You may have a corrupted Facebook app. If your Facebook app is corrupted, it may not work properly and may close unexpectedly. You can try reinstalling the Facebook app to fix this problem.