The document discusses the quantified self movement and tracking personal metrics like food, exercise, mood, sleep, and other daily activities using sensors, mobile devices, and data sharing through cloud-based tools. It poses the question of how these quantified self methods and tools could be used to solve issues like improving access to fresh produce, getting people to exercise more, helping people quit smoking, eating healthier, preventing distracted driving from texting, finding healthy food options, understanding calorie counts, and helping people relax, in order to improve the health of New Yorkers through social technology approaches.