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<?php
//DO NOT COPY THE ABOVE PHP tag -- change yourprefix_ in two locations


add_filter( 'pre_get_avatar_data', 'yourprefix_remove_gravatars_from_pinterest_choices', 10, 2 );
/**
 * Add html5 atts on all avatars to remove from Pinterst choices
 */
function yourprefix_remove_gravatars_from_pinterest_choices( $args, $id_or_email ) {
	$args['extra_attr'] = 'data-pin-no-hover="true" data-pin-nopin="true"';
    return $args;
}