Link:

http://www.bbc.co.uk/science/humanbody/mind/surveys/smiles/

I've already retweeted this from Catarina's twitter stream but I just thought of blogging this anyway to highlight the quiz.

That said, I don't know the accuracy of this quiz (I felt it needed more sincere but clearly fake smile from a personal issue perspective) but I got 10 out of 20 so I maybe it is an accurate and (potential) exercise for Hikikomories.