Capgemini (large dutch IT consultant) suggests using facebook as primary authentication for online transaction between citizens and the government
(translated) news message:
http://nl.babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwebwereld.nl%2Fnieuws%2F110366&lp=nl_en&btnTrUrl=Vertalen