The document discusses how to harness the power of smart citizens to build smart cities. It describes collecting data from citizens through a mobile crowdsourcing application called CitiAct that allows them to report issues with photos, track issues to resolution, and provide feedback to city councils. This citizen-generated data can then be combined with data from IoT sensors to gain insights into problems like drainage issues, crime areas, and traffic in order to optimize city resources. The document also promotes partnering with companies to implement a smart city solution based on an open IoT platform called RIOT.