If you have ever downloaded Facebook on your Apple ID before, you can download a compatible legacy version: Open the and go to the Purchased tab. Find Facebook and tap the cloud icon.
: You will likely need a separate legacy IPA for Messenger (versions around v80-v90) or use the mobile web version to view messages. facebook ipa for ios 935 verified
Because the modern Facebook app requires iOS 13 or later, users on iOS 9.3.5 must use a "legacy" version of the app. The term "verified" in this context usually refers to an IPA file that is either signed with a valid Apple certificate (allowing it to install without a computer) or has been verified to be the specific legacy version compatible with iOS 9. If you have ever downloaded Facebook on your