Gravatars are Globally Recognized Avatars. They allow people to carry the same avatar from site to site without having to register at each site and take the time to upload an image.
Gravatars are supported by IntenseDebate by default. If a user has a gravatar and gives the email address that the gravatar is tied to when they make a comments, then the gravatar will be displayed beside that comment.
Since version 2.5, WordPress MU has had gravatar support built in. Let's add gravatars to our post pages.
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