Yes, it's true that Trump had much more negative press in the New York Times, Washington Post, CNN, etc. But a huge segment of our population does not rely on those sources for news. Lots of people get their news from Facebook. And stuff doesn't randomly show up on your facebook feed. If your friends are all pro-Trump/anti-Hillary, and you tend to click on news (or fake news) that is pro-Trump/anti-Hillary, then your newsfeed will be overwhelmingly pro-Trump/anti-Hillary. That's the issue we're talking about.