Experimental evidence of massive-scale emotional contagion through social networks
Adam D. I. Kramera, Jamie E. Guillory, Jeffrey T. Hancock, Proceedings of the National Academy of Sciences of the United States, Jun 28, 2014

To borrow from an old quote, it renders quaint normal concerns about research ethics. Facebook is performing experiments to manipulate users' emptions. From the paper:  "We show, via a massive (N = 689,003) experiment on Facebook, that emotional states can be transferred to others via emotional contagion, leading people to experience the same emotions without their awareness." Via William Hughes.

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