““The privacy issue was reignited in early 2014, when the Wall Street Journal reported that Facebook had conducted a massive social-science experiment on nearly seven hundred thousand of its users. To determine whether it could alter the emotional state of its users and prompt them to post either more positive or negative content, the site’s data scientists enabled an algorithm, for one week, to automatically omit content that contained words associated with either positive or negative emotions from the central news feeds of 689,003 users. As it turned out, the experiment was very “successful” in that it was relatively easy to manipulate users’ emotions, but the backlash from the blogosphere was horrendous. “Apparently what many of us feared is already a reality: Facebook is using us as lab rats, and not just to figure out which ads we’ll respond to but to actually change our emotions,” wrote Sophie Weiner on AnimalNewYork.com.””
