Instead of civic organizations, we join internet mobs. Instead of reasoned conversation, the voices of the angriest, most divisive participants are amplified. Rational voices are hard to hear; radicalization spreads quickly. Unsurprisingly, an internet controlled by a tiny number of secretive companies in Silicon Valley does not reflect democratic values of openness, accountability and respect for human rights. Instead, the current rules of online conversation are undermining our democracies. Why don’t we change them?

Pulitzer Prizewinning historian Anne Applebaum is author of Twilight of Democracy: The Seductive Lure of Authoritarianism. Simon Schama is University Professor of Art History and History at Columbia University, New York.