Stemming off my story named Google: We Don't Have "Overall Domain Authority" In Our Rankings - Alan Bleiweiss said "if an overall authority didn't exist, Wikipedia couldn't rank for single page topics."
But Gary Illyes from Google took issue with that comment. He said that people are very likely to link to individual Wikipedia pages, internal pages within Wikipedia versus the home page.
Gary wrote in response, "Wiki is really good at getting its signals fast for individual pages," adding "i.e. people link more readily to it."
@AlanBleiweiss @RyanJones @rustybrick Wiki is really good at getting its signals fast for indiv. pages. I.e. people link more readily to it
— Gary Illyes (@methode) October 29, 2016
I do agree, I rarely would ever link to Wikipedia's home page (see what I did there) but rather prefer linking to a individual web page at the site.
I guess Gary is able to see this pattern as a whole because of the Google link graph.
Forum discussion at Twitter.