Download Facebook for Blackberry torch 9800
Step 1: Slide your finger left on the display to open the major menu. Tap BlackBerry World.
Step 2: Tap Search.
Step 3: Type in Facebook and tap Search.
Step 4: Tap Facebook.
Step 5: Tap Download. Wait a minute while the application is installed.
Step 6: Slide your finger up the display starting from the bottom edge of your smart phone to go back to standby setting.
I really hope the above brief tutorial can assist you. Thanks.