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In this paper, we propose a new map-based collaboration environment 'MapWiki' for ubiquitous content distribution. In MapWiki, users can publish Wiki contents which contains links or inline images of the objects in the ubiquitous environment by simple formatting rules. The status change of the content are updated on the map in real-time which enables users to communicate between real field and virtual environment. Publishers and receivers are authenticated using social network to ensure the trustfulness of the content. We implemented MapWiki mechanism on Google Maps and evaluated its feasibility and usefulness.