If the App Store method does not work, you can "sideload" a specific .ipa file (an iOS application package) from a computer.
Modern versions of Facebook require iOS 13.4 or later. When you try to download it from the App Store on iOS 9.3.5, you often get an error saying the app is incompatible, or you're prompted to download the "last compatible version," which sometimes fails to log in due to outdated API protocols. facebook+ipa+for+ios+935+best
Here are some frequently asked questions about Facebook IPA for iOS 9.3.5: If the App Store method does not work,