A Facebook spokesman told CNET, a tech media website, that the glitch happened because of "one of our most recent code pushes" but it was only live for a short time and "not all content was accessible".
http://ummid.com/news/2011/December/07.12.2011/facebook_fndrs_pvt_photos.htm
http://ummid.com/news/2011/December/07.12.2011/facebook_fndrs_pvt_photos.htm
