o botão que vejo é o Like (gosto)!!!
a tal janelinha tem no url
http://www.facebook.com/connect/connect_to_external_page_widget_loggedin.php?social_plugin=like&external_page_url=http%3A%2F%2Fwww.forumscp.com%2Fwiki%2Findex.php%3Ftitle%3DWiki_Sporting#_=_
a tal janelinha tem no url
http://www.facebook.com/connect/connect_to_external_page_widget_loggedin.php?social_plugin=like&external_page_url=http%3A%2F%2Fwww.forumscp.com%2Fwiki%2Findex.php%3Ftitle%3DWiki_Sporting#_=_