Social Network Modules: Do The Capture Social Network Email Addresses?

[selectionperfection2012]

Hi everyone,

 

I was just wondering if anyone has purchased one of the Social Media add-ons that allows a customer to register/authenticate themselves on a site using their Facebook/Twitter/Google+ account details?

My main question is, if they only use their social accounts to log-on, and then subsequently leave the site, are their social media "email addresses" captured in the Back Office for me to use for future advertising? Or do they have to complete the full registration process (ie. when they attempt to purchase a product) before they are logged in the BO as a "new Customer"?

 

Any information would be appreciated. Thanks

 

SP