Are you trying to install this on a (like a Nokia or BlackBerry) or a modern PC emulator ?

Before installing APKs outside the Google Play Store, you must grant permission.

If you are searching for a "Facebook 2.0.3.46 download," you must exercise extreme caution. Because this app is no longer officially distributed by Meta (Facebook's parent company), you have to rely on third-party software archives. This introduces several major risks: 1. Security Vulnerabilities

Avoid clicking on generic, ad-heavy download sites. Instead, look for reputable internet preservation repositories:

: Lacks the heavy background tracking and syncing protocols of current versions. Risks of Downloading Vintage APKs

This is the official, modern successor to "Facebook for Every Phone." It is designed for Android devices, takes up very little space, uses minimal data, and works perfectly on 2G and 3G networks while remaining secure.