fMobi is one of the most popular Facebook clients for Symbian. Yes, there's the official front end built into the OS and Nokia Social bringing it all together, but fMobi puts the whole Facebook experience into a fast and glossy front end, and it's now been updated to v3.5, bringing several photo uploading improvements plus official compatibility with Symbian Nokia Belle FP2.

Written in Qt, here's fMobi in action:

fMobi starting up..... and its homepage of main Facebook functions

The new photo gallery for picking snaps to upload; and the normal newsfeed stream

From the official fMobi blog:

There is a new update waiting for you in the Nokia Store.

There are the following updates:
- Native photo gallery to uploads.
- Native photo gallery to selecting custom background.
- Option for FP2 keyboard, so text fields don’t go behind it.
- Widget settings should be available again with latest Belle firmwares.
- Fixes & tweaks.

fMobi is available in 7 day trial form for free, or you can take my recommendation and just pay the £1.50 to get the full application up front.