I have a FB question. If a group of users have registered for the Forum the typical way (clicking Register and providing email/password/etc), and then over time you decide to enable users to Log In with Facebook, will the existing user base that have email/password logins be able to log in with their Facebook account? Note: the email addresses of these users will likely be the same as the email address associated with their FB account? And if so, can they switch back and forth, choosing to access the Forum occasionally via email/password and on other occasions via Log In with Facebook?
Thx in advance.