Dear Facebookers - Your private inbox messages are now visible for all to see, from 2007 and later. This could get VERY awkward, very quickly...this is a new change from Facebook as of yesterday. Don't believe me? Read your timeline from those years...yikes! They look like wall posts.....they are not!
There's an easy fix--when you're in your own timeline, just click on the year on the right (2007..., 2008, 2009) and you'll see a box with a bunch of friends' messages and a header that says 89 people have written on Brian's timeline--hover over the right until you see the pencil, click and select hide from timeline. do that for each year.