It was not that Facebook allowed the user to deselect the e-mail address from what would be shared. Rather, it allowed them to randomly generate an e-mail addre

It was not that Facebook allowed the user to deselect the e-mail address from what would be shared. Rather, it allowed them to randomly generate an e-mail address to share with the other party. I think messages sent to this address were forwarded to the user's Facebook inbox. And to answer scarlac's question, yes, they removed this feature a very long time ago.