Facebook and YouTube’s vaccine misinformation problem is simpler than it seems

Before social media, the dominant information sources — newspapers, magazines, TV news shows — had all sorts of flaws and biases. But they also shared, broadly speaking, a concern for the truth. That is, they subscribed to an expectation that factual accuracy was core to their mission, even if they didn’t always get it right. (There are exceptions, of course, including a certain cable news network that has broadcast more than its fair share of vaccine misinformation.)