Check out this story about an alleged hacker caught by the FBI. It seems that a photo of the hacker’s girlfriend posted on Twitter was linked to the alleged hacker’s Facebook page and that the GPS metadata embedded in the photo (oops!) was then used to pinpoint his whereabouts.
This case is a perfect example of the power metadata in digital forensics. More information, including the fateful image, can be found here on The Hacker News. For additional information on Forensic FOCA, a tool for forensic analysts focused on the use of metadata files to generate a forensic case, check out this site.