Is this a fake smile?

If one's face is an advertisement for one's thoughts and disposition, one needs to parse which ads are honest and which are late-night infomercials. So, how good are you at spotting fake smiles? Take this quick BBC psychology test and find out. Results reveal its actually very difficult to distinguish between genuine and fake smiles. The survey posits, "One possible explanation for this is that it may be easier for people to get along if they don't always know what others are really feeling." By the by, the smile pictured is fake. Via.