2.9: “Facebook Is a Human Laboratory”

“Facebook is the greatest human laboratory in history. There’s no need to bother with consent forms: users agreed when they signed up.”

So argued a 2014 Forbes commentary criticizing a covert experiment Facebook conducted in January 2012 (Hill, 2014). Without explicit consent, Facebook manipulated the News Feeds of 689,003 users, skewing posts toward either positive or negative content. The goal was to examine whether emotions spread across social networks—what researchers termed emotional contagion (Kramer et al., 2014).

The results were unsurprising but unsettling: users exposed to more negative content posted more negative updates, and those exposed to positivity posted more positive updates. Critics condemned the study as unethical “emotional manipulation,” violating established norms of research ethics (Meyer, 2014). Facebook defended the study, arguing it fell within its Data Use Policy and that no data were externally shared (Kramer et al., 2014).

The backlash reinforced a broader critique: on Facebook, users effectively function as unwitting test subjects, and the company has repeatedly shown willingness to push ethical boundaries if doing so strengthens engagement and revenue (Vaidhyanathan, 2018).

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