This "study" simply tells me really nothing. It does sort out the types of users who want to connect and click on those posts in questions.
Personally speaking, I would look elsewhere for a more in-depth and bias-free analysis for any business driven venture. Too much presumptions made in this article. Just that the way it defines “meaningful interactions”, "divisive" topics, “angry” reaction, etc. is rather unprofessional.
A better way is to define and characterize the users of these news postings and get statistical averages on the response time and intensity of responses as well as commonly used words/phrase in reply.
Also, they tend to use a lot more inflammatory language and wound-inflicting statements than those in the middle or near-middle.
That's why we should refrain from being either group.