A peer system of subjects with health-related issues is formed based on an association of subjects and a particular type of electronic device or devices which provides information related to a specific health-related issue or issues obtained from particular subjects. By means of such associations, subjects can transmit to and receive messages from other subjects associated with the same type of electronic device. One way to associate subjects with health-related issues is through an association of a subject with a type or types of sensors. For example, each monitoring device may be associated with a subject, and the type or types of sensor or sensors may be associated with the subject and/or monitoring device. Devices, systems, methods and computer program products may be provided leveraging this association for various applications, e.g., management of the health care of subjects, peering among subjects with a common heath-related issue or issues, advertising, research and other applications involving such subjects.