Yesterday, Facebook announced that they are now supporting OpenID. OpenID is a free and easy way to use a single digital identity across the Internet. With one OpenID you can login to all your favorite websites, so you don’t need multiple username or log-in ids for different sites.
Facebook also streamlined the OpenID login process while maintaining security, converting the full-page redirect to a pop-up. They worked with the community to develop this pop-up extension to standardize the more streamlined user experience.
Now, users can register for Facebook using their Gmail accounts. This is a quicker, more streamlined way for new users to register for the site, find their friends, and start exploring.
Existing and new users can now link their Facebook accounts with their Gmail accounts or with accounts from those OpenID providers that support automatic login. Once a user links his or her account with a Gmail address or an OpenID URL, logs in to that account, then goes to Facebook, that user will already be logged in to Facebook.