title: MVC5 External Authentication get emails
body: <p>I have an existing website in MVC4.
  Now I am looking forward to upgrade it to MVC5.</p>
  
  <p>I wanna use External Authentication, however, what I want is that when use select any of the External Login option (Except Twitter, I am not going to use it), all I want is to get his/her Name and email address.</p>
  
  <p>I don't wanna store anything in the database with the username or other details associated.</p>
  
  <p>I just need to grab the Name and email address and if it matches with existing email, user will be logged in, otherwise, new account will be created.</p>
  
  <p>It will be great if anyone can help me with this with small tutorial, to read Name, email and other extra details from the user, instead of adding it to the database.</p>