According to new paper in the Proceedings of the National Academy of Science, Facebook altered the News Feeds for hundreds of thousands of users as part of a psychology experiment devised by the company's on-staff data scientist. By scientifically altering News Feeds, the experiment sought to learn about the way positive and negative effect travels through social networks, ultimately concluding that "in-person interaction and nonverbal cues are not strictly necessary for emotional contagion."
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