What is Christakis Fowler social network?

Christakis Fowler social network is a concept in personal epistemology: The people around you shape your choices — curate your social environment.

Example: You decide to start waking up at 6 a.m. to write before work. For two weeks you hold the routine. Then your roommate starts staying up until 1 a.m. watching shows in the living room, and you find yourself joining for "just one episode." Within a month, your wake-up time has drifted back to 7:30 and the writing has stopped. You blame your willpower. But your willpower did not change. Your social environment changed. The person in your living room reshaped your evenings, which reshaped your mornings, which reshaped whether you write. You did not fail at discipline. You failed at social environment design.

This concept is part of Phase 38 (Choice Architecture) in the How to Think curriculum, which builds the epistemic infrastructure for choice architecture.