This article illustrates the social potentials of wearable computers by discussing wearable communities, social networks based on augmented face-to-face encounters. It discusses social and technical issues of building wearable communities and introduces the WearCoM wearable community design methodology. WearCoM provides a systematic framework for rapid prototyping of wearable community systems. We summarize our experiences in using the WearCoM methodology as a set of design guidelines for wearable communities.