We envision the blossoming of citizen initiated sensing applications in an urban context, enabled by increasingly affordable and portable sensing hardware, and ubiquitous wireless access to communication infrastructure.

In this paper, we describe the Partisans architecture, featuring infrastructure-supported selective data sharing and verification services. This effort represents an evolution of activity on embedded networked sensing from the scientific application space to applications in a space that raises novel issues in privacy, security, and interaction with the Internet.