If you chode to use Facebook for credentials to other sites and apps, there's also a way to alter the permissions.

To delete Facebook's cache on an iPhone or iPad, you just need to uninstall the app, then reinstall it from the App Store. This only takes a minute and can be done in just a few steps.

New to Facebook? In this beginner-friendly tutorial, I’ll show you how to use Facebook step by step on the mobile app. You'll learn: How to set up your Facebook profile (photo, bio, and details ...

If you're a Facebook user, you're probably aware by now that you can no longer send and receive messages from within the mobile app. The company now requires you to use the standalone Messenger ...

Another way to clear your iPhone's Facebook cache is simply to delete and then re-install the app. Steven John/Business Insider Again, this won't harm any of your account data, photos, or posts.