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Facebook is a leading technological company. Its most influential products include Facebook platform, Face messenger, Instagram, WhatsApp and Oculus.

Emotional Contagion Experiment

In 2014, researchers from the Facebook Core Data Science Team published a paper about emotional contagion experiment KramerGJH-14.

The experiment was conducted on 689.000 real users and shows that it was possible to observe a change in the proportion of positive or negative words contained in user posts by slightly changing the content of their news feed. Although the effect sizes from the manipulations are small, the experiments took place for only one week.

After the publication of this paper, Facebook had to apologies for this study WASH-14 after many academics (and the public) raised concerns and the Proceedings of the National Academy of Sciences published an editorial concern PNAS-14.

Predicting depression

A study from 2018 shows that is was possible to predict depression from the history of Facebook statuses EichstaedtaSMUCPAS-18. By using language analysis from Facebook posts of consenting individuals, they were able to predict depression recorded in electronic medical records with a fair accuracy [area under the curve (AUC)=0.69].