CameraForensics

Search the web for other photos taken with the same camera.
Consumer version: http://www.stolencamerafinder.com
Law Enforcement version: https://www.cameraforensics.com

Currently, StolenCameraFinder customers can pay a monthly subscription to become a "Pro" member of the service which entitles them to more powerful searching and tracking tools.

More serious crimes are tackled by law enforcement using CameraForensics: https://www.cameraforensics.com/