You probably noticed the icon that now appears next to blog comments. To customize your avatar, signup at Gravatar.com. Gravatar avatars can be used in any blog that supports them because they are linked to your email address. Just enter the email address you use for your comments.
Source link: http://archive.mises.org/11545/how-to-update-your-avatar-in-blog-comments/
How to update your avatar in blog comments
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