A problem I see is when we move to allowing "Social Login"; the issue here would be when it's "allowed" it'll have to be globally on, since a user would use it to login there would be no preferences...
How do these users deal with sites that use facebook connect, everywhere has these buttons now (news sites, google has the +1 all over their site, video sites have share buttons, etc).
In my experience these triggers aren't sent unless someone actively engages with the connect boxes (by way of actually sharing content) and just the buttons being there there isn't a trigger...
You might have to consult with the creators of the software (or one type of software) to be sure; but i'd imagine a good chunk of the net shows share buttons at this point, it's just how things are done now (especially forums) to get users attracted to content since it's free to do and works with active pages on fb...
