My Galaxy S6 had my Facebook contacts synchronized within the Contacts application since I acquired the phone in September 2015. I didn't exactly notice when it happened, but now this feature does not seem to work anymore. I have the latest update of the Facebook application.
When going in the Android settings under "Accounts", I can see the Facebook item but it is shown as "disabled". There does not seem to be any way to enable this synchronization. I think I remember there used to be some options on that screen to enable contacts synchronization.
Another detail is that all the contacts that came from Facebook are still listed in the Android Contacts application, however, the contact information is empty and it is shown as a contact stored locally on the device only.