Stories like this really push back against the filter bubble thesis:
It was 2:45 a.m. on a Thursday last April. Matthew Rognlie was still awake, like a lot of graduate students. He had just finished typing 459 words and a few equations. They totaled six paragraphs, which he posted to the comments section of a popular economics blog.
Thus begins the unlikely story of, arguably, the most-influential critique of the most influential economics book of this century.