This presentation contains an overview about things to keep in mind when trying to build a community. As one of the first slides already states: you cannot create a community, it is already there. However you can help the community better in several ways. Therefore a model of the different phases of a member in a community is used. Based on this model several actions are defined which a community manager could take to help the community. The last few slides contain an overview of several well known social media cases.
The basis for each community is to get to the outsiders (and at the start of each community platform everybody is an outsider) and to facilitate them to progress through several phases to go from passive to active membership and some of them might even progress to passionate members.