“Gravatars are Globally Recognized Avatars. An avatar or gravatar is an icon, or representation, of a user in a shared virtual reality, such as a forum, chat, website, or any other form of online community in which the user(s) wish to have something to distinguish themselves from other users.”

I’ve just finished enabling gravatars on my blog, and this was as simple as adding the gravatar code in my theme. Starting with WordPress 2.5 gravatars are enabled by default without any additional plugin needed, and you only need a compatible theme to start using gravatars. This was not the case with my theme so I had to add a simple code to enable this:
<?php echo get_avatar( $comment, $size = '32' ); ?>
There are other parameters you can use, and they can be found here: http://codex.wordpress.org/Gravatar

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