At this point it appears the only way for existing users to tie their existing facebook account to their VB profile is to log-out, select the facebook logo, then make the connection. It would be great if VB users could access this page when logged in to add their existing facebook profile:
The a dismissable notice would be great for the option listed above for existing users.. I tried this but after adding the code nothing happens (after clicking any of the logos) since the user is already logged in..