Urban Mediator by Joanna Saad-Sulonen: a hybrid infrastructure for neighborhoods is a project grounded in dialogues with people and the urban environment as a way of gaining understanding of urban everyday practices. It's targeted at creating Mediator, an hybrid infrastructure to support interaction possibilities in hybrid space (physical-digital).
A network of information servers (neighborhood servers) lies at the heart of the hybrid infrastructure. Interaction with these servers can happen at specific locations in urban space, interactive spots, through proximity connection between people’s own devices and interactive public boards (neighborhood boards) or through localized access to WiFi. Interactive spots can exist at places of waiting, like bus stops or public squares. Connection to the servers can also happen through the Internet.
Yet another place-based note sharing app.
I like the author's reseach mindmap: