Throwing Pebbles into a Dark Cave: A Study of Participation and Behaviour in the {act-km} Online Community

This paper defines online communities and their constituent elements. It provides a framework in which online communities can be discussed and compared irrespective of topic or content. It explores the notions of core and peripheral membership and behaviour and provides a set of metrics for determining the activity profile of the community. Finally it presents a case study of an online community and discusses it using the framework and metrics presented