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---Apologies for cross-posting--- Colleagues/ New Book on Folksonomies recently published! It summarizes the extensive scientific discussion about folksonomies and points out the value of folksonomies in the areas of knowledge representation and information retrieval. /Wolf Isabella Peters: Folksonomies. Indexing and Retrieval in Web 2.0, 2009, Berlin: de Gruyter, Saur, 443p., ISBN: 978-3598251795. Preface In Web 2.0 users not only make heavy use of Collaborative Information Services in order to create, publish and share digital information resources - what is more, they index and represent these resources via own keywords, so-called tags. The sum of this user-generated metadata of a Collaborative Information Service is called Folksonomy. In contrast to professionally created and highly structured metadata, e.g. subject headings, thesauri, classification systems or ontologies, which are applied in libraries, corporate information architectures or commercial databases and which were developed according to defined standards, tags can be freely chosen by users and attached to any information resource. As one type of metadata Folksonomies provide access to information resources and serve users as retrieval tool in order to retrieve own resources as well as to find data of other users. The book delivers insights into typical applications of Folksonomies, especially within Collaborative Information Services, and discusses the strengths and weaknesses of Folksonomies as tools of knowledge representation and information retrieval. Moreover, it aims at providing conceptual considerations for solving problems of Folksonomies and presents how established methods of knowledge representation and models of information retrieval can successfully be transferred to them. Table of Contents 1) Introduction Current State of Research Open Questions in Folksonomy Research Notes on the Book's Structure Bibliography 2) Chapter 1: Collaborative Information Services Web 2.0 vs Social Software vs Collaborative Information Services Social Bookmarking Services E-Commerce Commercial Information Services Music-Sharing Services Libraries 2.0 - Museums Photosharing Services Videosharing Services Social Networks Blogs and Blog Search Engines Games with a Purpose (GWAP) - Tagging Games Summary Bibliography 3) Chapter 2: Basic Terms in Knowledge Representation and Information Retrieval Introduction to Knowledge Representation Paradigmatic and Syntagmatic Relations Ontologies Thesauri Classification Systems Nomenclatures Text-Word Method Citation Indexing Knowledge Representation in the World Wide Web Introduction to Information Retrieval Relevance Distributions Retrieval Models Text Statistics Vector Space Model Probabilistic Model Link Topology - Kleinberg Algorithm and PageRank Information Linguistics - NLP Similarity Coefficients and Cluster Analysis Network Model Bibliography 4) Chapter 3: Knowledge Representation in Web 2.0: Folksonomies Definition of the Term 'Folksonomy' Tags - Users - Resources Cognitive Skills Broad vs Narrow Folksonomies Collective Intelligence Tag Distributions Users' Tagging Behavior Tag Categories Tag Recommender Systems Advantages and Disadvantages of Folksonomies in Knowledge Representation Problem-Solving and Structuring Endeavors in Folksonomies Tag Gardening in Knowledge Representation Traditional Methods of Knowledge Representation vs Folksonomies Outlook Bibliography 5) Chapter 4: Information Retrieval with Folksonomies The Relation between Knowledge Representation and Information Retrieval Searching vs Browsing vs Retrieving Information Filters - Information Filtering - Collaborative Filtering Folksonomy-Based Recommender Systems in Information Retrieval Retrieval Effectiveness of Folksonomies Visualizations of Folksonomies Disadvantages of Folksonomies in Information Retrieval Query Tags as Indexing Tags Relevance Ranking in Folksonomies Power Tags Tag Gardening in Information Retrieval Outlook Bibliography 6) Conclusion Bibliography Index of Names Subject Index Target Groups "Target groups are librarians, information architects, knowledge managers, Web 2.0 aficionados and students of library and information science, computer science and computer linguistics." Book is available via: http://www.degruyter.com/cont/imp/saur/detailEn.cfm?id=IS-9783598251795-1. Enjoy Reading, Regards Wolf