Computer-implemented methods, computer software, and computer systems for synchronizing user relationship across computer systems implementing workspaces. A computer system that provides features accessible by users by executing a workspace is accessed. Features provided to the users by remaining computer systems depends on the relationships between the users. A triggering event that represents a change to the computer workspace—for example, addition or removal or a user in the workspace, addition or removal of content in the workspace—is detected. Features provided to a first user by the remaining computer systems is affected by the change. Changes in relationships between the first user and the remaining users responsive to the change are determined, and provided to one or more of the remaining computer systems as respective messages that include the changes in the relationships.