It's a set of three personality traits; wikipedia has a good overview here: https://en.wikipedia.org/wiki/Dark_triad https://en.wikipedia.org/wiki/Dark_triad I

It's a set of three personality traits; wikipedia has a good overview here: https://en.wikipedia.org/wiki/Dark_triad https://en.wikipedia.org/wiki/Dark_triad I think that people have lost a lot of privacy due to the adoption of networked technology over the past few decades, and one unusual side-effect, I think, could be that it may be much easier to identify and cluster people with these personality traits nowadays.