Facebook_S60_3.X_1.3.0.21.sis or similar. Source: Symbian repositories like syv.org or archive.org.
Don't expect stickers, voice notes, or location sharing. This was purely text and maybe (if you were lucky) a low-res image that took 45 seconds to download. Group chats were a disaster—messages arrived out of order, and the E72’s RAM often choked if a group got too active.
In its prime, there were two main ways to get Facebook on an E72: