Comment plus to create new user

If I am using comments plus what will happen if

– a user logins through a social id, would that create their user account with our site?

– If we are using the ultimate facebook as well and user was logged in using their facebook account and added message. what will appear his account on my site or his facebook id? What if he was not logged in and hit facebook in the comments box. What id woudl be used to post the comment?

– What if I am using a separate openid single signon to manage signups through social sites and also using this plugin for comments?