https://www.theguardian.com/technology/2014/jun/30/facebook-emotion-study-breached-ethical-guidelines-researchers-say https://www.theguardian.com/technology/201

https://www.theguardian.com/technology/2014/jun/30/facebook-emotion-study-breached-ethical-guidelines-researchers-say https://www.theguardian.com/technology/2014/jun/30/facebook-... https://www.pnas.org/doi/10.1073/pnas.1416405111 https://www.pnas.org/doi/10.1073/pnas.1416405111