When Google released +1, I quickly identified how to track interaction with that button. The obvious “follow up” was questions from people on how to track interaction with other buttons. Not for each of these social buttons tracking of interaction is actually possible. It depends on how the button was designed whether this will work or not. I got it working for Twitter and Facebook, so I’ll share the code for tracking interaction with their respective social buttons below.
Social Buttons: Adding them to your site & Tracking them [Yoast]