I have a user registered to my site through WordPress. A few days later they tried to log in to the site using Facebook (which uses the same email account).
A new user account was created for this person instead of realizing it was the same person because it uses the same email address. The email address for newly created account got changed to something like "FB_1023323@unkown.com".
Is there a way this plugin, either free or premium version, to not create a new user account if a user signs up to the site and then tries to connect using Facebook?