android is the package name for the Facebook SDK. The Facebook app's package is com. facebook. katana . Stack Overflow Older versions of Facebook (Android) | Uptodown
refers to a particular build of the Facebook for Android application. The numbering system (major.minor.patch) typically indicates: facebook apk 51 1 exclusive download
For security and the best experience, it is always recommended to use official sources: Google Play Store: android is the package name for the Facebook SDK
While there isn't a single "exclusive" version called 51 1, there are two primary ways to interpret your request based on current and historical versions of the Facebook app: Modern Version (511.x): As of May 2025, Facebook released version 511.0.0.73.36 Facebook released version 511.0.0.73.36