Instead of an ideological bias, what if it is just a demographic bias? The author supposes that there are some mustache-twirling masterminds behind the scenes at Google, Twitter, and Facebook, picking and choosing what content is promoted. But the algorithms, at their most basic sense, promote what is popular. Based on voting records, in absolute numbers, there are simply more left-leaning people (at least in the US)…
Uh, no, he points out, accurately, that the mustache-twirling "masterminds" are actually kicking people off of the site for having unapproved viewpoints.