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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. Our system defines CAM (Collaborative Authoring Metadata) for collaborative authoring in distributed environment. The CAM is used for the exchange of authoring intention of each user during the collaborative authoring. Several elements of CAM are defined, which are useful for exchanging information among distributed users. Our system also provides the recommendation engine for referring and adding the related contents media from the participants’ social media services account during the authoring process.