https://apis.google.com/js/plusone.js
http://www.facebook.com/plugins/like.php
http://platform.linkedin.com/in.js
http://connect.facebook.net/en_US/all.js
http://twitter.com/intent/
http://platform.twitter.com/widgets.js
http://www.google.com/buzz/api/button.js
http://s7.addthis.com/js/250/addthis_widget.js