64-bit architectures can address significantly more than 4GB of RAM, allowing the Facebook app to handle larger data caches and high-resolution media more efficiently.
An APK (Android Package Kit) is the file format used by the Android operating system for the distribution and installation of mobile apps. A 64-bit version is specifically designed to run on ARM64 or x86-64 CPU architectures. 64 bit facebook apk
Official Facebook APKs delivered through Google Play are signed and verified; installing APKs from third-party sources carries risks: 64-bit architectures can address significantly more than 4GB