There is provided a communication system for communicating messages between a group comprising a plurality of user accounts on a plurality of communication channels. At least some user accounts operate on a first communication channel and at least some of the other user accounts operate on at least a second communication channel different to the first communication channel. A plurality of integration modules are provided, associated with a unique communication channel. Data stores retain user account identification information and membership in groups are accessible by a central messaging module to send and receive messages. A method is also provided for performing the same.