I found this site just a couple of days ago and found it very interesting. All you do is put in the URL of a picture and it does some weird technical jazzy thing and comes up with where that picture can be found elsewhere on the internet. For example, I put in a portrait of a recognizable figure, and instantly got back near too 800 results, showing where that picture pops up around the internet, and also showing the picture in various stages of photoshop. However, I must point out the ToS of the site clearly states "Submission of pornographic or illegal files is strictly prohibited." Just thought it was quite a weird and wonderful thing. .