It is a design choice to offer a news feed that combines verified news sources with conspiracy blogs — interspersed with photos of a family picnic — with no distinction between these very different types of information. It is a design choice to use algorithms that find the most emotional or outrageous content to show users, hoping it keeps them online. And it is a design choice to send bright red notifications, keeping people in a state of expectation for the next photo or juicy piece of gossip.

Platform design is a silent pilot steering human behavior.