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And I want to point out something else that's probably crucial to learning from past mistakes.

When we build a social media platform – when we build anything to allow people to interact in the internet – we are doing something very like building a planned city. We are making decisions about the structures through which people will flow and move and rest and encounter one another and interact with one another.

When architects are designing physical buildings and when urban planners are laying out physical cities, they make decisions about physical structures with the intention of those structures shaping human behavior. People who build amphitheaters are people who want there to be public addresses that many people here, whether political speech or entertaining theater. People who build temples are people who want there to be collective religious worship. People who build roads want there to be travel.