
You can track shared links in Google Analytics.
<script type="text/javascript"> a2a_track_links='ga'; </script>
You can track shared links using bit.ly.
<script type="text/javascript"> a2a_track_links='bitly'; a2a_track_links_key='addtoany|R_4ed7bcc558a86d04901bfae7c3a20bb5'; </script>
You can track shared links using awe.sm (and Google Analytics).
<script type="text/javascript"> a2a_track_links='awesm'; a2a_track_links_key='7e9fd830bd2402479a0603c05632f638a3ea76cb241212dd8c95c17a99f3d01b'; </script>
You can track shared links using a custom URL.
<script type="text/javascript"> a2a_track_links='custom'; a2a_track_links_key='http://example.com/abc123'; </script>