Facebook somehow found a new way to violate people’s privacy, this time by using hundreds of thousands of its “friends” as guinea pigs in a psychological experiment.

To recap, Facebook teamed with Cornell University and the University of California-San Francisco to determine whether heavy exposure to positive or negative posts can influence people’s emotions. For one week in January 2012, 689,003 news feeds were tweaked to skew positive or negative, and researchers kept track of what kind of posts people entered in response.

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