Is it possible to limit Facebook login to members who have already signed up for my website? Basically, I have limited the registration to .edu emails, and I would like to integrate the FB login. Unfortunately, if I enable it now, anyone can join my site outside of the .edu emails. I just want the option for current users to log in using Facebook. Another question is if this is all possible, would their Facebook email also have to be the .edu email? Thanks!