Current method of social login is a bit backwards, one can only login via their social network (currently facebook and twitter) on initial login, but once logged in cannot connect/link their social accounts cuasing a lot of confusion (or relying on 3pd products).
It would be great if one can link their social account once they are already logged in to the site (either have a link button, or dedicated page/view). Attached is an image of how JFBConnect handles social login (dedicated menu item).
Chaim