Cambridge Analytica

https://motherboard.vice.com/en_us/article/mg9vvn/how-our-likes-helped-trump-win

This Vice article was the fist I heard about this, well over a year ago. The original story broke from a journalist in Germany in 2016. I found it fascinating how simple the idea was. This paragraph is particularly compelling:

"The strength of their modeling was illustrated by how well it could predict a subject's answers. Kosinski continued to work on the models incessantly: before long, he was able to evaluate a person better than the average work colleague, merely on the basis of ten Facebook "likes." Seventy "likes" were enough to outdo what a person's friends knew, 150 what their parents knew, and 300 "likes" what their partner knew. More "likes" could even surpass what a person thought they knew about themselves. On the day that Kosinski published these findings, he received two phone calls. The threat of a lawsuit and a job offer. Both from Facebook."
 

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