Oh I just found this too, submitted https://www.wikimediastatus.net/incidents/nb6v1zxp86ns

I thought I was mainly looking at two numbers: points and comments. However, after I've built a scatter plot of HN, I realized that's not enough. I still visit HN frequently to look for links with interesting keywords, or from specific domains.

But one thing is sure, I seldom look at the user, whether it's green or not.

I guess they know each other as they have a lot of collaborations, such as this one [1].

[1] http://www.chaos-math.org/en