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In todays knowledge driven society, the efficiency of the transfer and acquisition of knowledge has gained importance. In order to acquire new knowledge, a user needs information about the problem domain and the concepts within the knowledge structure. This information is required to create an internal representation of the knowledge structure. Due to the high amount of information available, retrieving suitable information is a strenuous task. It is particularly time consuming to identify promising sources and queries concerning the individual concepts. By applying the powerful concept...

Recent years brought a shift in the focus of Web applications towards social interaction, collaboration and networking. One aspect in this context is the rising importance of social media, which encompass various applications for the publication of user-generated content. Social media have also influenced technology-enhanced learning and teaching. The collaborative aspects of social media suit the constructivist learning theory, while the communicative aspects may be applied to fostering informal learning. This book investigates the way learning and knowledge acquisition occur in such...