No place to hide!
I just read this post from Tech.Blorge about “Polar Rose” – software that combines social bookmarking with face recognition. The company claims that they developed a software capable of recognizing faces based on the visual elements (and not text or meta-data) and they rely on their users to create a database of recognized pictures to train the program. So, tomorrow, when you upload yet another image of yourself to FaceBook and your friends tag it with Polar Rose, you will be leaving another, rather deep, footprint in the digital world.
Both spooky and amazing at the same time.