One thing that bugs me is how comments are linked to "interest". There are many topics that interest people (passive consumption), that do not necessarily tran

One thing that bugs me is how comments are linked to "interest". There are many topics that interest people (passive consumption), that do not necessarily translate into engaging in a conversation with others publicly. As a marketing term - sure, that would be a good indicator of interest. Since this article is more scientific than marketing-oriented, I would clarify what some of the metrics mean (or don't mean). Excellent, fantastic visualizations though!