DHAKA: A study detailing how Facebook secretly manipulated the news feed of some 700,000 users to study ‘emotional contagion’ has prompted anger on social media.

For one week in 2012, Facebook tampered with the algorithm used to place posts into user news feeds to study how this affected their mood.

The study, conducted by researchers affiliated with Facebook, Cornell University, and the University of California at San Francisco, appeared in the June 17 edition of the Proceedings of the National Academy of Sciences (http://www.pnas.org/content/111/24/8788.full.pdf).

The researchers wanted to see if the number of positive, or negative, words in messages they read affected whether users then posted positive or negative content in their status updates. Indeed, after the exposure the manipulated users began to use negative or positive words in their updates depending on what they were exposed to.

BDST: 2024 HRS, JUNE 29, 2014