How can Facebook know if we are happy or not? This is something that I questioned , but the key is a simple indicator that Facebook implemented in the state bar that
says:
What are you thinking about? .
With this method, each word that users write is analyzed. For example: enjoying , great , terrible , stressing are key words. Facebook has first experimented with United States'population in english ; obtaining very interesting results and realizing that people is generally happier in holidays. Facebook is thinking of expanding these experiments in other languages and countries as well.
http://eluniverso.com/2009/10/08/1/1431/facebook-lo-sabe-todo-incluso-somos-felices.html?p=1354&m=1775
Would you consider this measuring technique as valid? Would you trust on these results?