A lot of these social things allow you to connect a social media account to an existing account you have on a website.

I noticed in one thread you can't use the login because emails match existing users.

Would it be possible from a logged in account to "connect" the facebook account to the account so that it would replace their information with the facebook login information.

I have an existing site I'd like to use this with, but there are hundreds of members, and there is a connected phpbb forum with jfusion, so it would be a real pain to go through and delete or manually connect accounts.

Could there be a button on their profile page that would cause them to pull up the facebook interface and overwrite their existing account info with that info?