What exactly can OpenID do?

This is a website called "Whisper," which provides value-added services based on OpenID. It breaks traditional communication methods; as long as you remember the other person's OpenID, log in to "Whisper" and send them a message, and it will use all available communication channels to deliver the message to the recipient. These channels include mobile phones, instant messaging (IM), emails, and other contact details filled out when registering for an OpenID. You don't need to worry about spam, as OpenID's own authentication mechanism effectively blocks advertisements and junk messages. Moreover, the "Whisper" backend provides buttons to turn communication channels on or off. Simply turning all of them off ensures that you will never receive any unsolicited messages. The Firefox browser can install a Whisper toolbar, making it convenient to communicate directly through the browser. Thus, Whisper covers communication methods such as mobile phones, IM, email, and browsers, making communication in the Web 2.0 era smoother and more seamless. All you have to do is remember the other person’s OpenID. Whisper is indeed an impressive and unique idea.