http://thenextweb.com/facebook/2012/09/24/facebook-users-seeing-private-messages-showing-timelines/
Facebook has been accused of inadvertently publishing private messages on users’ Timeline profiles from the years 2007, 2008, 2009, and possibly even earlier. The issue was first reported by Metro France, but soon reports from all over over started to flood in. Facebook has denied the claims, saying the posts in questions are indeed old Wall posts, but readers are saying otherwise.