Note, in the screenshot, that 'Tips and Tricks After 50 Pages on Wizzley' is showing at the top with 29 comments; has an article score of 80; and was written 3 days ago by JoHarrington. Now that is significant, in that it demonstrates one of the effects 'Author score' has on popularity, as outlined in that article.
Jo, being at the premier position on the 'Best Authors' page, has received a generous boost to her visitor numbers, such that her recent article (together with her honed article writing skills) has received a good quantity of comment. I can assume that this article has received a commensurate number of 'likes' etc.
Equally the effect of reaching 100 recently, by Katiem2, has likely been an effect in her article showing at the top of 'Popular' and 2nd in 'Buzzing' lists.
That is an effect of becoming an author with a high score.