Abstract: A chat system comprises a chat room application (Team Chat application) running on a chat server connected to a computer network having a plurality of users. The Team Chat application is configured to produce a chat room interface on the display of users accessing the chat room site. The chat room interface includes a central chat display area flanked on either side by two lists of users identifying themselves in support of one of the two sides of a rivalry (e.g., team A or team B). Once a user is logged in and identifies which team (i.e., side of the rivalry) they support (e.g., either team A or team B), the user and other users affiliated with that team will be represented on one side of the central chat display area (e.g., the left side), and the users affiliated with the rival team will be represented on the other side of the central chat display area (e.g., on the right side). Users cannot participate in the chat until they log in and identify which side of the rivalry they support.