[Plugin: WP Socializer] Service PlusOne

I’m adding WP Socializer into my theme manually so that I can control the positioning as I desire using the following:

<?php
if (function_exists('wp_socializer') ) :
echo wp_socializer('socialbts' , array (  'type' => '32px',
'services' => 'twitter,facebook,digg,linkedin,plusone,email' ));
 endif; ?>

However the plusone button does not work, it gets changed to a bookmark button instead, looking at the source code this service does not seem to exist?

http://ww.wp.xz.cn/extend/plugins/wp-socializer/