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This paper describes collaborative social authoring technology using web-based distributed user interface (DUI). In view of collaboration, web is one of the most common user environments on various systems of desktop and mobile devices. This paper addresses the DUI issues for the support of multiple kind of devices, such as PC, smartphone, tablet and so on. In our system, we define CAM (Collaborative Authoring Metadata). CAM is used for the exchange of authoring intention of each user during the collaborative authoring. We define elements of CAM that is useful for exchanging information among distributed users. Our system also provides the recommendation function for referring and adding the related media from the participants’ social media service account during the authoring process.