The document discusses how digital technologies can empower citizens to take collective action to advocate for their community needs. It examines existing examples like openIDEO, Sparked, and PeopleMakeParks that use online, mobile and physical participation. These vary in aspects like platform, facilitator, participant tasks, timeline and metrics. The author proposes a new platform that combines online and mobile participation for challenges created by organizations and individuals. Next steps would include use cases, solidifying the platform concept and preparing mockups. The goal is to increase citizens' ability to engage in positive community change through collective action.