Abstract: A system is disclosed that enables peer-to-peer interactions between individual users sharing an interest in a health condition. The system provides the service in return for the user providing the system with data relating to lifestyle and health of the user, including those relating to diet, exercise, use of diagnostic and drug delivery devices, medication frequency and compliance with the medication regimen. The health profile data is used to generate parameters including a level of expertise of a user and a quality indicator for the data provided by the user. The database containing health profile data is accessible to a subscriber who queries the data anonymously to retrieve information.