the new, algorithmic gatekeepers aren’t merely (as they like to believe) neutral conduits for both truth and falsehood. They make their money by keeping people on their sites and apps; that aligns their incentives closely with those who stoke outrage, spread misinformation, and appeal to people’s existing biases and preferences. Old gatekeepers failed in many ways, and no doubt that failure helped fuel mistrust and doubt; but the new gatekeepers succeed by fueling mistrust and doubt, as long as the clicks keep coming.

How social media took us from Tahrir Square to Donald Trump”, by Zeynep Tufekci, MIT Technology Review