A prompt will appear saying: "The current version requires iOS 13.4 or later, but you can download the last compatible version." Tap . 2. Using an IPA File (Manual Installation)

This creates a Facebook icon on your home screen that looks and feels like an app. It uses no storage space, doesn't crash, and works with the current Facebook login system.

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If you have never downloaded Facebook on your current Apple ID, you can "link" it using a newer device.