There are no configurations to be found in the "Social Login Merge Account" profile options section. You would expect options to link and un-link your account to the different social networks, but no options are presented to do so.
It would be very useful if from this section you were able to link and/or un-link your account to all of the available social networks.
The ability to register and login with a social network is the main reason why I started using, and will continue to use, this site.