Syncing contacts from the Facebook app into your contacts may be useful to some, but for others it creates extra clutter in their contacts area. Follow these steps to remove the link between Facebook and your contact list.
How to disable Facebook contacts in the BlackBerry 10 contacts app
Step 1. tap on the contacts icon and go from there:
Step 2. Once launched, you’ll want to swipe down from the top to reveal the settings icon.
Step 3. Tap on the settings icon to be taken into the settings screen.
Step 4. Now that you have the contacts setting screen open. On the Facebook slider, just pull it over into the “Off” position
The Facebook updates and other information that were once present in your Contacts list will now be removed. And, of course, you can always re-sync Facebook and your Contacts at a later time if you have a change of heart.