> OK -- doesn't it matter that the left has, I don't know, 85% of the market share (that's what the tech giants endlessly blast out)?
This isn't true. Fox News has been rated the most watched network many times including in July. According to a previous post here on HN, a lot of highest trending stuff spread on FB is right-wing.
Also almost all US media is to the right of almost all European media (notable exceptions including Poland and Hungary.)