The Wordress Snippets series of posts will give you some useful code snippets for use in your projects – just copy and paste (but try to understand how they work!).

This snippet will add rel="nofollow" to the links in your blogroll, or those outputted by wp_list_bookmarks. Add to functions.php or your links template.

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function nofollow_my_bookmarks( $links ) {
    foreach($links as $link) {
        $link->link_rel .= ' nofollow';
        $link->link_rel = trim($link->link_rel);
    }
    return $links;
}
add_filter('get_bookmarks', 'nofollow_my_bookmarks');

How it works

WordPress uses a function called get_bookmarks when it gets links for your blogroll – we use a filter to hook in and add the ‘nofollow’ rel tag.