Zeynep Tufekci writes: Responding to President Trump’s tweet this week that “Facebook was always anti-Trump,” Mark Zuckerberg, the chief executive of Facebook, defended the company by noting that Mr. Trump’s opponents also criticize it — as having aided Mr. Trump. If everyone is upset with you, Mr. Zuckerberg suggested, you must be doing something right.

“Both sides are upset about ideas and content they don’t like,” he wrote in a Facebook post. “That’s what running a platform for all ideas looks like.”

This doesn’t hold water at all.

Are you bothered by fake news, systematic misinformation campaigns and Facebook “dark posts” — micro-targeted ads not visible to the public — aimed at African-Americans to discourage them from voting? You must be one of those people “upset about ideas” you disagree with.

Are you troubled when agents of a foreign power pose online as American Muslims and post incendiary content that right-wing commentators can cite as evidence that all American Muslims are sympathizers of terrorist groups like the Islamic State? Sounds like you can’t handle a healthy debate.

Does it bother you that Russian actors bought advertisements aimed at swing states to sow political discord during the 2016 presidential campaign, and that it took eight months after the election to uncover any of this? Well, the marketplace of ideas isn’t for everyone.

Mr. Zuckerberg’s preposterous defense of Facebook’s failure in the 2016 presidential campaign is a reminder of a structural asymmetry in American politics. It’s true that mainstream news outlets employ many liberals, and that this creates some systemic distortions in coverage (effects of trade policies on lower-income workers and the plight of rural America tend to be underreported, for example). But bias in the digital sphere is structurally different from that in mass media, and a lot more complicated than what programmers believe. [Continue reading…]