Facebook is more than just a social network, it is also officially an_online science laboratory. The company has revealed in a research paper that it carried out a week-long experiment that affected_nearly 700,000 users to test_the effects of transferring emotion online. The News Feeds_belonging to_689,003 users of the English language version were altered to see “whether exposure to emotions led people to change their own posting behaviors,” Facebook says. There was one track for those receiving more positive posts, and another for those who were exposed to more emotionally negative content from their friends. Posts themselves were not affected and...

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