A method and system for information distribution. A response to a message is received from a first member of a group G of a cascade of groups. The cascade of groups includes at least two groups. The message originated from a member of an originating group. The message was adapted to be sent one group at a time in accordance with a specified delivery sequence to each group of the cascade of groups. The message was received by the group G. The originating group does not include the first member. The response falls into a first response class of a plurality of response classes. A category of membership in the originating group is assigned to the first member. The category of membership is based on the first response class.