While official Facebook support requires iOS 15.1 or later, users can install a "Last Compatible Version" on iOS 12.5.5 devices by downloading the app through the "Purchased" section of the App Store, often requiring a previous download on a newer device. Due to potential instability with older app versions, utilizing Safari to create a web app is a recommended alternative. For more details, visit the Apple Support Community . How can i install Facebook in ios 12.5.5 - Apple Community
By finding an , you can bypass the App Store restriction and install a version of Facebook that was compatible with iOS 12. facebook ipa for ios 1255
This is the safest and most reliable way to get a compatible version of Facebook without searching for sketchy IPA files online. While official Facebook support requires iOS 15