1. Facebook vows to fix major privacy breach-Australian report Sep. 2011 http://www.Foxnews.com
2. Google to pay $22.5 million to settle privacy charges July 2012 http://www.IBM
3. Linkedln sheds more light on Privacy Breach Jun 2012 http://www.IBM
4. Dropbox confirms it got hacked http://www.Foxnews.com
5. A privacy preserving authorization system for the cloud;Chadwick;Elsevier-Journal of Computer and System Sciences,2012