> From the perspective of the employer, Github, Bitbucket and other code sharing sites simply do not have these biases - when employers look at these sites, there is no demographic information on users to look at other than what the user voluntarily puts up.
But there is demographic information there. Ashe Dryden's original article (http://ashedryden.com/blog/the-ethics-of-unpaid-labor-and-th...) called it out in this paper on gender in FLOSS: http://flosspols.org/deliverables/D16HTML/FLOSSPOLS-D16-Gend...
Essentially, I can guess that any particular GitHub user is a white, upper-middle class man and be right most of the time.
I understand that this article isn't saying "We Use Only GitHub Profiles" when hiring but acting as though the code present there exists with zero social context seems willfully wrongheaded.