For those of you who haven’t heard about it yet, Facebook recently published a study they did on their users’ emotional states in 2012. They randomly generated two groups of about 700,000 users, then used an automated system to manipulate their news feeds. For one group, they culled news posts containing more positive language and smiling, happy faces; for another, they culled posts containing more negative language and unhappy faces. They then measured the users’ own news posts over the course

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