If you specifically need the "standard" old Facebook experience, you must manually install an APK (Android Package) file from a third-party repository. Older versions of Facebook (Android) | Uptodown
💡 Older versions may eventually lose connectivity as Facebook updates its API. If the app says "Please Update," you must use the mobile browser method. facebook para android 5.1 version antigua
Cuando abra la app, a veces aparecerá un cartel que dice "Actualiza la aplicación para continuar". Toque fuera del cartel o cierre y vuelva a abrir. Si insiste, desinstale e instale una versión un poco más nueva. If you specifically need the "standard" old Facebook
Since the Google Play Store may only show you the latest (incompatible) version, you may need to use an APK. facebook para android 5.1 version antigua