The document proposes the development of an "Open System Mobilization Platform" to enable large-scale collective action online to solve global problems. Key components of the vision include: 1) Being self-organizing to allow teams and projects to form and strategies to develop on the platform. 2) Having open projects that are designed to accommodate as many participants as possible. 3) Having the catalytic capacity to connect people to projects and organizations in real-time, generating new ideas and collaboration off the platform. 4) Being designed from the start to support large-scale collaboration with thousands or hundreds of thousands of users working on open projects.