A study detailing how Facebook secretly manipulated the news feed of some 700,000 users to study “emotional contagion” drew anger anger on social media. In 2012, the social network tampered with the news feed algorithm to study how positive and negative posts affected users’ mood. The study showed the manipulated users reacted depending on the positive or negative messages they were exposed to. Results of the study spread when online magazine Slate and The Atlantic website wrote about it on Saturday. The authors of the study said their institutional review boards approved the research “on the grounds that Facebook apparently manipulates people’s News Feeds all the time.”
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