Facebook has said that they retain the information for short periods to detect fraud. http://blogs.wsj.com/digits/2011/09/26/facebook-defends-getting-data-from-

Facebook has said that they retain the information for short periods to detect fraud. http://blogs.wsj.com/digits/2011/09/26/facebook-defends-getting-data-from-logged-out-users http://blogs.wsj.com/digits/2011/09/26/facebook-defends-gett...