Someone running iOS 6, 7, or 8 on a classic device cannot run the modern Facebook app. They must use an old IPA. Where to Find Old Version IPA Files
Having a specific version's IPA file allows you to install that exact version manually. facebook old version ipa
While the lure of a simpler Facebook is strong, the dangers of installing an old IPA from an untrusted source are significant and should not be underestimated. These are not theoretical risks—they are well-documented concerns that have been reported for years. Someone running iOS 6, 7, or 8 on