This was the last straw for me, thats when I permabanned facebook from my life. This was an unauthorized, unguided, unethical, mass psychological experiment on human beings. Anyone involved should have gone to jail for crimes against humanity.
The outcome of this experiment is that for a few days, around 150k people posted ~0.3% more negative words on Facebook. Is that something engineers and data scientists should be imprisoned over? I think most US politicians cause bigger effects every time they tweet.
I for one, do not believe that a bunch of twats in silicon valley give a crap about ethics, do you?