Facebook: 'Creepy' Secret Experiment Attacked


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A study carried out by Facebook and two universities has angered users who have accused the social network of manipulating their emotions.

The US technology firm secretly altered the news feeds of 700,000 users as part of the study, which explored "emotional contagion".

The social network tampered with the algorithm which controls users' feeds in order to find out how the changes affect their moods.

Researchers wanted to see if positive or negative words in messages led to positive or negative content in users' status updates.

The study took place over one week in 2012, and was conducted in conjunction with Cornell University and the University of California.

The findings were published in the June 17 edition of the Proceedings of the National Academy of Sciences.

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