I would like to let visitors choose between signing up by using Drupal's core sign-up system, or to register using their Facebook account.
I looked at a few Facebook related modules but that was a little confusing, and I couldn't make up my mind on which one to use (I don't use Facebook myself so I guess that doesn't help).
What are the differences between regular registered users and those who signed up using their Facebook account?
Will Drupal have access to their emails?