What are the ethical consequences of this mechanism? It seems social media is becoming increasingly like an echo chamber, which might explain why politics, for instance, are growing increasingly polarized. It seems increasingly rare for groups on the internet to confront different opinions directly - people gravitate towards groups who agree with them, and without any outside forces to challenge them, it becomes easy to be misled and indoctrinated (anti-vaxx, for instance). Do tech companies have a responsibility to minimize this influence?