Download Blackberry Facebook App
Step 1: Slide your finger left on the screen to open up the primary menu. Tap BlackBerry World.
Step 2: Tap Search.
Step 3: Key in Facebook and touch 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 mobile phone to go back to standby mode.
I really hope the above short tutorial could aid you. Thanks.