stolencamerafinder can locate a missing camera by searching for photos on the web that have been taken by that camera.
Every photo you take with your digital camera contains hidden information about both the image and the camera such as the make, model and date. This information, called exif data, can also include a unique serial number which identifies your camera.
stolencamerafinder crawls the internet searching for photos, collecting the serial numbers of the cameras that took them.
You can help the database grow by simply installing the free Chrome extension
from the makers of OddPrints