Colab is a mobile app that uses social networking as a tool to encourage transparency and collaboration for improved city management. It was created by five young Brazilian entrepreneurs as a platform to facilitate communication channels between civil society and governments. Colab promotes connections between citizens and encourages civic participation in making positive changes to the city. The app allows citizens to report on problems, for example safety, public lighting or parking, through uploaded photographs with geolocation that are shared with other users who can provide suggestions for addressing them. With the registered complaint, city authorities can respond directly to any claim, forward requests to the appropriate teams for action, and monitor their status. The app is currently being used in several municipalities in Brazil, including São Paulo and Curitiba.