Web 2.0 platforms such as media sharing and social network sites (SNS) concern people in everyday life to a great extent. People are enabled to reach out to various media and up to now, it is nearly impossible to use digital identities ex ante or to recreate users’ identities ex post across...

Story-telling has been a means of bequeathing knowledge since aeons. Whereas the idea of the story-telling remains unaltered, the world around undertakes continuous changes. New media, new technologies and devices, new ways of communication define a new format of the story-telling. This paper...

Multimedia creation, annotation and sharing are challenging tasks especially of interdisciplinary, intercultural and intergenerational communities. We present the mobile social software Virtual Campfire to provide cross-media and cross-community support for de- and recontextualization of...

Collaborative Filtering(CF) is a well-known technique in recommender systems. CF exploits the relationships between users and recommends the items to the active user according to the ratings of his/her neighbors. CF su®ers from the data sparsity problem, where users only rate a small set of...