Recently I discovered a "Nudity Detector" () web service. Basically you give it an image and it gives you a Nudity score. Most likely this is used to censor images on websites that don't allow nudity. However I've decided to use it in conjunction with the Facebook API to rank pictures so one could more easily find the "more interesting" pictures on Facebook. My protoype seems to be working, however I lack the webspace to host it currently, but when I do I shall share it with all of you.
As most image processing algorithms nothing is perfect so you'll get some false positives and false negatives. However the following image scored by far the highest score of any image I've seen so far at a whopping 99.9. This means that it's nearly certain that nudity exists in this image if I understand this algorithm correctly. Without further ado, below is that image: (Click for full size)