OpenID is a safe, faster, and easier way to log in to web sites. OpenID authentication is now used and provided by several large websites. Providers include AOL, BBC, Google, IBM, MySpace, Orange, PayPal, VeriSign, LiveJournal, Steam, and Yahoo!.
Please notice that OpenID is not an email address, but it is in the form of a unique URI. The following is an example of OpenID: https://profiles.google.com/u/0/116909643154243929442/about
Chances are that you already have an OpenID. If you do not know your OpenID, this page may help you.