People use familiar networked technologies for coordinating social activities, from games to problem-solving. Such sociotechnical networks have been called social machines, and can be found in healthcare and well-being, crime prevention, transport, citizen science, and in particular during emergencies such as the COVID-19 pandemic. The role of platform(s) as host(s) is key as to how, and how privately, the social machine operates. Social machines can be monetized on the DC Commercial Internet, and monitored on the Beijing Paternal Internet. One means of democratizing the platform is the project to re-decentralize the Internet and Web, to break down the walls of walled gardens and restore decentralization. One such idea, Solid, is described in detail, where people take charge of their personal data, storing it as linked data to increase its utility, but keeping it in personal online datastores (pods) under their control.