Wanted to say this.

I know they have, but I wonder how far they can take it.

I know Facebook was using their algorithm to try to control people emotions. This could be used during events where they want the populace to feel a certain emotion at certain point of time.

I wonder if they control the addictiveness of the algorithm making it more addictive one day and less addictive the other day.

Television and antisocial behavior: field experiments by Stanley Milligram, he talks about how people were more likely to commit anti-social behavior when they saw another person doing doing it through media.

https://annas-archive.pk/md5/029bf0cd4994d570a552227f56a5a25b?check=1