Facebook conducted a study on nearly 700,000 users by manipulating their news feeds . Robert Cohen : Facebook basically tried to alter people 's mood without their knowledge . He says despite Facebook 's user policy , this study violates accepted research ethics . Facebook : We should try to avoid as much as possible becoming human guinea pigs .
Facebook conducted a study on nearly 700,000 users by manipulating their news feeds . Robert Klitzman : Facebook basically tried to alter people 's mood without their knowledge . He says despite Facebook 's user policy , this study violates accepted research ethics . Klitzman : We should try to avoid as much as possible becoming human guinea pigs .