New 'Secretbook' Lets You Leave Hidden Messages In Your Facebook Photos

A British student has released a Google Chrome extension that enables you to hide secret messages in your Facebook pictures.  Owen Campbell-Moore, studying computer science at Oxford University, used a technique called JPEG Steganography to make tiny changes in photos that form a secret code. Called 'Secretbook', you can now download it and communicate with your friends without anybody else knowing you are doing it.