While you may find "verified" download links on third-party sites or archives, the official Facebook app for Symbian no longer functions Security Risks : Downloading

Some extreme retro-modding communities have successfully run modified, ultra-light J2ME midlets designed to bridge modern APIs with old hardware. However, these require custom firmware, a high degree of technical skill, and are rarely stable enough for daily use. Critical Safety Tips for Downloading Legacy Apps

The Nokia 5800 XpressMusic remains a capable media player and a nostalgic piece of tech. While tracking down a of the original Facebook app is a fun project for preservationists, the practical reality is that the app may no longer function due to server-side changes by Meta.

Because the keyword “nokia 5800 xpressmusic facebook app free download verified” is searched often, malicious actors have created fake installers.

If you are a hobbyist looking for archived software, some communities still maintain legacy repositories: Facebook for Every Phone : A Java-based (