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Facebook experimented on users in 2012
Some Facebook users are upset after hearing news the company was experimenting with their emotions
Researchers manipulated the content some users were shown.
For one week in early 2012, Facebook changed the content mix in the news feeds of nearly 700,000 users.
Some people were shown a higher number of positive posts, while others were shown more negative posts.
The study found that users that were shown more negative content were slightly more likely to produce negative posts and users in the positive group responded with more upbeat posts.