He deserves a lot of credit
https://en.wikipedia.org/wiki/Facebook%E2%80%93Cambridge_Analytica_data_scandal
Discussion
what's a psychological experiment? A/B testing?
They were doing a study on how manipulating the algorithm could result in a change in users' emotional states
Sounds evil when it's put that way. But, consider what practically every business does every day with A/B testing. Literally playing on your emotions to buy. Not defending FB, but they sure do get a lot of focus when everyone is basically doing the same thing.
That's very fair. The scale is probably the thing that makes it so clearly unethical because you're not casting a line into a crowded pond anymore, you're competely changing the environment the fish swim in.