The paper is devoted to finding a view on business processes that helps to introduce into business process support systems a notion of shared spaces widely used in social software. The paper presents and analyses the experience of the authors from a number of development projects aimed at building business process support systems. The authors define a role that shared spaces can play in business process support and set some requirements on the shared space structure based on this role. They then analyze their projects in order to show how these requirements can be met and describe what practical results have been achieved in each project.