In traditional collaborative scenarios discussion plays a key role in the negotiation of jointly developed, shared understandings (the essence of collaboration), acting as a point of mediation between the individual collaborators and the outcome which may or may not eventuate from the discussions. Mass collaboration reverses this relationship with the work being done providing the point of mediation between collaborators, with associated discussions being an optional component. It is of course debatable that discussion is optimal, as most (if not all) mass collaborations have discussions associated with the content being developed. However it is possible to contribute (to Wikipedia for instance) without discussing the content you are contributing to. (Smaller scale collaborations might be conducted without discussions especially in a non-verbal mode of work - imagine two painters contributing to the same canvas - but the situation becomes increasingly problematic as more members are included.)