The document discusses four key ingredients for developing a digital city: 1) A desire for citizens to talk about things in the city, 2) A strong social culture where citizens interact, 3) Open access to city data, and 4) Issues for citizens to advocate for or against. It argues that combining a citizens' cognitive surplus and freely available public data through various online and offline social platforms can create new economic opportunities and an engaged digital workforce that shapes the future of the city from the bottom up. Realizing this vision will likely involve tensions between various stakeholders, but this messy process is an important part of cultivating an innovative digital culture.