1. A computer-implemented system for distributing messages by discussion group, comprising: a monitor module to monitor discussion groups; a verification module to verify an identity of a participant in each of two or more of the discussion groups; a receipt module to receive voice signals from the participant; a speech module to distinguish speech of the participant from ambient noise and third-party conversations in the voice signals; an identification module to identify one of the discussion groups specified by the participant to be associated with the voice stream; and a delivery module to transmit the speech as a voice message to other participants in the identified discussion group.