They at least did doubtful experiments [1]. [1] http://www.nytimes.com/2014/06/30/technology/facebook-tinkers-with-users-emotions-in-news-feed-experiment-stirr

They at least did doubtful experiments [1]. [1] http://www.nytimes.com/2014/06/30/technology/facebook-tinkers-with-users-emotions-in-news-feed-experiment-stirring-outcry.html http://www.nytimes.com/2014/06/30/technology/facebook-tinker...