fMobi was always the best Facebook client on Symbian, keeping track of Facebook's numerous changes better than most software. And it still works today. Better yet, it's now free and available in the AppList Store for Symbian (what do you mean, you're not using this? You're 'doing it wrong'....)

Here's the brief description in AppList:

The best Facebook client for your phone. 

Chat or share status. Checkin. Upload photos. Comment and like your friends' posts. Look at your friends photos & albums and much much more!

More than 25 languages included!

Also in AppList by the same developer, also now free, is fChat:

fChat is the fastest, coolest, simplest and the most beautiful chat for Facebook.

You can chat with your online friends and you can also search offline friends and send messages to them too!

- (Home screen widget) [temporarily] removed to make chat working with latest fb changes
- White and black theme
- Adjustable font size
- Audio alert

Hopefully the AppList Store is working out for you all. See here just in case you haven't already got this installed or if this is new to you. Also, if you have custom firmware installed, make sure you tick the option in settings to show 'unsigned' applications, you'll see extra applications!