How To Delete Facebook Contacts
Settings > Facebook > Contacts
Maybe you've established your Facebook account in iOS, while unknowning that a contact sync would occupy your address book with great deals of entries that may be undesirable. Thankfully, this choice is entirely reversible.
Go to your "Settings" app and pick the "Facebook" entry, then disable the toggle labeled "Contacts". This will get rid of all Facebook contacts from your in your area saved address book. The contacts/friends themselves will stay active on Facebook, so don't worry.
If you open up the "Contacts app" on your iPhone, you ought to see that all of the entries previously listed in the "All Facebook" group are entirely gone now.
Ways to hide Facebook contacts on iPhone
Contacts > Groups
If you wish to keep the additional contacts that are synced from your Facebook account to your iPhone's address book ("Contacts" app), but hide them from the primary contact list, you can do so by changing your view settings.
Open the "Contacts" app and tap "Groups" at the top left of the screen. Then scroll down to "All Facebook" at the really bottom and uncheck the item on the list. You can check any other group to make it visible, such as your iCloud contacts or other groups you may have enabled on your iPhone. Tap "Done" when all set.
The "Contacts" app will now conceal the Facebook contacts in the main list view. Your other contacts need to still show up.
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