i remembered reading about this as i was leaving the house earlier tonight... tinyeye is web site that creates a database of pictures... and is suppose to be able to identify multiple locations of the same picture... so let's say both a facebook page & mfc profile have the same picture on them and tinyeye has crawled both pages... it's suppose to be able to identify the link between the unrelated web sites
http://www.tineye.com
http://www.tineye.com