Beautiful tongue-in-cheek blog article by Kieran Healy  on how much you can achieve with a little metadata. Some historical knowledge on the separation of the American colonies helps to relish this text. It also shows how much can be revealed by "just" metadata – and for us non-US citizens it's even more than metadata if you read Obama's statement on this.

http://kieranhealy.org//blog/archives/2013/06/09/using-metadata-to-find-paul-revere/