With Facebook making this change, I guess anyone who is unaware of this and syncs their Facebook contacts to their phone (either directly or via apps) stands to lose the 'real' email addresses of their friends and especially once they sync back to their desktop/cloud/gmail etc!!
On my Android the Facebook details are in a separate bucket than my Gmail contact details. So the Facebook sync hasn't overridden the email addresses that were manually entered by me or have been synced by Google's Contacts.
But on the other hand I'm seeing a lot of new Facebook email addresses in my contacts.
