I recently started use a new Chrome extension named data selfie an extension that help understand what could be understood, about you, from facebook data, believe me it scare a lot.
Data Selfie - Chrome extension from DATA X on Vimeo.
Micro expressions are very brief facial expressions, lasting only a fraction of a second. They occur when a person either deliberately or unconsciously conceals a feeling. Dr. Ekman’s research has revealed that seven emotions have universal signals: anger, fear, sadness, disgust, contempt, surprise and happiness. You can learn to spot micro expressions using the micro expressions training tools personally developed by Dr. Ekman.