The Electronic Privacy Information Center, or EPIC, filed a complaint against Facebook with the Federal Trade Commission over the social network's experiment where it manipulated the posts users saw to gauge emotional reactions. The group claims Facebook acted unethically and "purposefully messed with people's minds."
EPIC files FTC complaint against Facebook over 2012 social experiment
Facebook conducted a week-long experiment in 2012 where it manipulated thousands of user's feeds so some saw mostly negative posts while others saw mostly positive. Users were then monitored to see if the posts they saw had an impact on what they wrote on their own Facebook walls.
While conducting emotional response experiments isn't necessarily unethical, it's the way that Facebook went about collecting its data that's a problem: No one was told they were part of the study.
Facebook is facing an investigation in the UK, too. The Information Commissioner's Office is looking into whether or not Facebook's study broke local laws, and if so, the company could face up to a £500,000 fine.
Facebook said it will cooperate with the ICO's investigation, but has not yet commented on EPIC's complaint with the FTC.