iOS 6 Facebook Integration: How may I extract contacts from iPhone?
The answer lies in the Contacts applications for OS 10.7+. First, you must set iCloud in System Preferences to sync your contacts, or you can sign into Facebook (if you're using Mountain Lion).

Then, open Contacts and select the "All Facebook" item to the left of the window. Select all visible contacts by clicking within the contact list and pressing ⌘A.

Go to File > Export… > Export vCard… and save with the name and location you desire.