Here's a far easier, more comprehensive solution for this: http://penguininitiatives.com/track-social-shares-addthis-widget-google-analytics/
The Like button in your website header seems to be tracking correctly. The following _utm.gif request is being made:
The links in the social bar on the left-side of each post will not be tracked, because the social actions script is designed to hook into specific events raised by Twitter and Facebook. These events are not called by the share actions in he social bar.
Edit: the Like buttons for each post on the homepage are working also. Is this issue resolved?
Update: The Social Bar to the left of your articles won't work, because they are coded differently to the Google examples and use different hooks. The Like button at the end of each post, just above the 'About the Author' section, does work, because it is a standard Like button.