We propose a novel community communication system called Public Opinion Channel (POC). Existing communication systems have limitations on eliciting and circulating opinions from community members because communication costs for receiving, sending, and selecting information are high. To augment social intelligence of a community, (1) eliciting diverse opinions from community members, and (2) circulating opinions in the community are important. We propose POC prototype system for augmenting social intelligence of a community by eliciting and circulating diverse opinions. We adopted (1) passive message viewing and (2) anonymous messaging of opinions for reducing the communication costs. The system generates and updates a story that is a series of opinions and broadcast to community members continuously. Design concept and an overview of the POC system are described.