Facial Emotion Analysis

Well known work by Paul Ekman is covered in the WSJ. " ...  The Technology that Unmasks Your Hidden Emotions ... Using Psychology and Data Mining to Discern Emotions as People Shop, Watch Ads; Breeding Privacy Concerns .... Companies are amassing an enormous database of human emotions using technology that relies on algorithms to analyze people’s faces and potentially discover their deepest feelings. While the evolving technology has many potential benefits, it's also raising privacy concerns .... " .  The big databases analytics aspects of this is also interesting.