Gravatar Signup is a plugin that puts a checkbox in your comments form that says “Sign me up for a free Gravatar!” If the user checks that box, some additional text and a password field will appear right below the checkbox. If the comment form is submitted with the Gravatar box checked, with a valid e-mail address provided, and with a password in the Gravatar password field, the plugin will sign the commenter up for a Gravatar as their comment is posted. They’ll get an e-mail from Gravatar just as if they had used the signup form at the Gravatar site.

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