Just to report that i am not getting the plugin to work.
As with other users who have reported this issue, i also have GD2 enabled.
In the rendered source, just above the security code input box, i found:index2.php?option=com_comprofiler&task=tabclass&Itemid=1&tab=getcaptchatab&no_html=1
* LIKE thumbs up system for "liking" content items
* Karma - CB user rating system
* Golf Score Tracker
* Jitter - status update system. "What's on your mind?"
* CB Author Plug - Shows CB author link and avatar in content items. J1.5 compatible and very customizable!