http://www.ruhanirabin.com/how-to-add-facebook-like-button-to-wordpress-posts/
https://dev.twitter.com/docs/tweet-button
http://diythemes.com/thesis/rtfm/add-google-plus-1-share-button/
http://ottopress.com/2011/adding-googles-1-button-to-wordpress-sites/
ajax:
http://forum.developers.facebook.net/viewtopic.php?id=68635