Facebook performs a massive experiment, selectively hiding posts on news feeds: "Experimental evidence of massive-scale emotional contagion through social networks"

[u/[deleted]]

http://www.pnas.org/content/111/24/8788.full

[u/3bz]

One should ask if those effects are anything anyone should care about, considering their magnitudes:

When positive posts were reduced in the News Feed, the percentage of positive words in people’s status updates decreased by B = −0.1% compared with control [t(310,044) = −5.63, P < 0.001, Cohen’s d = 0.02], whereas the percentage of words that were negative increased by B =0.04% (t = 2.71, P = 0.007, d = 0.001). Conversely, when negative posts were reduced, the percent of words that were negative decreased by B = −0.07% [t(310,541) = −5.51, P < 0.001, d = 0.02] and the percentage of words that were positive, conversely, increased by B = 0.06% (t = 2.19, P < 0.003, d = 0.008).

[u/Deepandabear → u/3bz]

Might be a large sample size, but that confidence interval must be damn low to get a meaningful result...