Apparently Facebook manipulated 700,000 of it’s users news feeds to test whether it could make them happy or sad.
Which made me think of this (slightly modified) movie quote:
Did you know that the first Facebook was designed to be a perfect human world? Where none suffered, where everyone would be happy. It was a disaster. No one would accept the program. Entire crops were lost. Some believed we lacked the programming language to describe your perfect world. But I believe that, as a species, human beings define their reality through suffering and misery. The perfect world was a dream that your primitive cerebrum kept trying to wake up from. Which is why the Facebook was redesigned to this: the peak of your civilization.