As the number of virtual communities is explosively increasing these days, many papers have been published on the effective and efficient use of those communities. Among various aspects of virtual communities, this paper has an interest in the collective power of consumers that may be generated naturally by the interactions among members of communities. If consumerism might be built in virtual communities, societal marketing could be implemented positively through those communities. The result shows that though societal marketing has not been implemented yet, the potential turns out to be great.