Embodiments of the invention provide a method, devices, and system for monitoring and sharing emotion-related data from one or more persons connected via the internet. An emotion monitoring device (EMD) measures physiological signals obtained from biosensors and computes emotion states relating to emotional arousal and valence. Various signal processing methods are employed to reduce artifact and improve the detection of emotional states. The EMD communicates the emotion data to an internet server via a wireless network. The internet server transmits the emotion data to other persons equipped with an EMD. Their emotion data similarly is obtained and shared with others. The networked emotion data can used to enrich online, community experiences such as games and social networks. An implementation of an EMD based on a smart phone enables emotion data to be monitored in wide area, mobile environment. The biosensors can be integrated into the casing or a cover for the mobile phone.
