For all you who aimed to integrated Facebook contacts and are now thinking that it was an error, here's how you can get rid of Facebook Contacts from coming up on your iPhone/iPad contacts lists.
How To Delete Facebook Contacts
Maybe you've established your Facebook account in iOS, while not knowing that a contact sync would populate your address book with great deals of entries that may be unwanted. Luckily, this choice is totally reversible.
Go to your "Settings" app and select the "Facebook" entry, then disable the toggle labeled "Contacts". This will remove all Facebook contacts from your locally stored address book. The contacts/friends themselves will remain active on Facebook, so don't worry.
If you open the "Contacts app" on your iPhone, you need to see that all of the entries formerly listed in the "All Facebook" group are entirely gone now.
Ways to conceal Facebook contacts on iPhone.
If you want to keep the additional contacts that are synced from your Facebook account to your iPhone's address book (" Contacts" app), but conceal them from the main contact list, you can do so by adjusting your view settings.
Open up the "Contacts" app and tap "Groups" at the top left of the screen. Then scroll down to "All Facebook" at the extremely bottom and uncheck the product on the list. You can inspect any other group to make it visible, such as your iCloud contacts or other groups you may have allowed on your iPhone. Tap "Done" when prepared.
The "Contacts" app will now conceal the Facebook contacts in the primary list view. Your other contacts should still show up.
Hint: You can manage contact groups directly on your iPhone. Learn more How To Delete Facebook Contacts.