BibSonomy publications for /user/stumme/bibsonomyThu Feb 10 20:54:48 CET 2011Berlin / HeidelbergThe VLDB Journal849-875The social bookmark and publication management system bibsonomy1920102010 BibSonomy Journal VLDB VLDBJ itegpub l3s myown Social resource sharing systems are central elements of the Web 2.0 and use the same kind of lightweight knowledge representation, called folksonomy. Their large user communities and ever-growing networks of user-generated content have made them an attractive object of investigation for researchers from different disciplines like Social Network Analysis, Data Mining, Information Retrieval or Knowledge Discovery. In this paper, we summarize and extend our work on different aspects of this branch of Web 2.0 research, demonstrated and evaluated within our own social bookmark and publication sharing system BibSonomy, which is currently among the three most popular systems of its kind. We structure this presentation along the different interaction phases of a user with our system, coupling the relevant research questions of each phase with the corresponding implementation issues. This approach reveals in a systematic fashion important aspects and results of the broad bandwidth of folksonomy research like capturing of emergent semantics, spam detection, ranking algorithms, analogies to search engine log data, personalized tag recommendations and information extraction techniques. We conclude that when integrating a real-life application like BibSonomy into research, certain constraints have to be considered; but in general, the tight interplay between our scientific work and the running system has made BibSonomy a valuable platform for demonstrating and evaluating Web 2.0 research.Wed Dec 22 00:32:33 CET 2010Raleigh, NC, USAProceedings of the 19th International World Wide Web Conference (WWW 2010)aprStop Thinking, start Tagging - Tag Semantics emerge from Collaborative Verbosity2010bibsonomy delicious emerge itegpub l3s myown semantic semantics social start tagging thinking web Recent research provides evidence for the presence of emergent semantics in collaborative tagging systems. While several methods have been proposed, little is known about the factors that influence the evolution of semantic structures in these systems. A natural hypothesis is that the quality of the emergent semantics depends on the pragmatics of tagging: Users with certain usage patterns might contribute more to the resulting semantics than others. In this work, we propose several measures which enable a pragmatic differentiation of taggers by their degree of contribution to emerging semantic structures. We distinguish between categorizers, who typically use a small set of tags as a replacement for hierarchical classification schemes, and describers, who are annotating resources with a wealth of freely associated, descriptive keywords. To study our hypothesis, we apply semantic similarity measures to 64 different partitions of a real-world and large-scale folksonomy containing different ratios of categorizers and describers. Our results not only show that ‘verbose’ taggers are most useful for the emergence of tag semantics, but also that a subset containing only 40% of the most ‘verbose’ taggers can produce results that match and even outperform the semantic precision obtained from the whole dataset. Moreover, the results suggest that there exists a causal link between the pragmatics of tagging and resulting emergent semantics. This work is relevant for designers and analysts of tagging systems interested (i) in fostering the semantic development of their platforms, (ii) in identifying users introducing “semantic noise”, and (iii) in learning ontologies.Wed Dec 15 11:43:00 CET 2010Toronto, CanadaProceedings of the 21st ACM conference on Hypertext and hypermediaVisit me, click me, be my friend: An analysis of evidence networks of user relationships in Bibsonomy20102010 analysis bibsonomy evidence itegpub l3s links myown networks semantic sna web Wed Dec 15 11:38:10 CET 2010Barcelona, SpainProceedings of the Workshop on Mining Ubiquitous and Social Environments (MUSE2010)Community Assessment using Evidence Networks20102010 assessment bibsonomy community evaluation evidence itegpub l3s myown networks Community mining is a prominent approach for identifying (user) communities in social and ubiquitous contexts. While there are a variety of methods for community mining and detection, the effective evaluation and validation of the mined communities is usually non-trivial. Often there is no evaluation data at hand in order to validate the discovered groups. This paper proposes evidence networks using implicit information for the evaluation of communities. The presented evaluation approach is based on the idea of reconstructing existing social structures for the assessment and evaluation of a given clustering. We analyze and compare the presented evidence networks using user data from the real-world social bookmarking application BibSonomy. The results indicate that the evidence networks reflect the relative rating of the explicit ones very well.Wed Dec 15 11:31:36 CET 2010Berlin / HeidelbergInformatik-Spektrum1-12Datenschutz im Web 2.0 am Beispiel des sozialen Tagging-Systems BibSonomy20102010 bibsonomy datenschutz info2.0 itegpub l3s myown privacy web2.0 Soziale Tagging-Systeme gehören zu den in den vergangenen Jahren entstandenen Web2.0-Systemen. Sie ermöglichen es Anwendern, beliebige Informationen in das Internet einzustellen und untereinander auszutauschen. Je nach Anbieter verlinken Nutzer Videos, Fotos oder Webseiten und beschreiben die eingestellten Medien mit entsprechenden Schlagwörtern (Tags). Die damit einhergehende freiwillige Preisgabe oftmals persönlicher Informationen wirft Fragen im Bereich der informationellen Selbstbestimmung auf. Dieses Grundrecht gewährleistet dem Einzelnen, grundsätzlich selbst über die Preisgabe und Verwendung seiner persönlichen Daten zu bestimmen. Für viele Funktionalitäten, wie beispielsweise Empfehlungsdienste oder die Bereitstellung einer API, ist eine solche Kontrolle allerdings schwierig zu gestalten. Oftmals existieren keine Richtlinien, inwieweit Dienstanbieter und weitere Dritte diese öffentlichen Daten (und weitere Daten, die bei der Nutzung des Systems anfallen) nutzen dürfen. Dieser Artikel diskutiert anhand eines konkreten Systems typische, für den Datenschutz relevante Funktionalitäten und gibt Handlungsanweisungen für eine datenschutzkonforme technische Gestaltung.Wed Dec 15 11:29:09 CET 2010Berlin / HeidelbergThe VLDB JournalThe social bookmark and publication management system BibSonomy20102010 BibSonomy VLDB VLDBJ bookmark itegpub l3s management myown publication social system Social resource sharing systems are central elements of the Web 2.0 and use the same kind of lightweight knowledge representation, called folksonomy. Their large user communities and ever-growing networks of user-generated content have made them an attractive object of investigation for researchers from different disciplines like Social Network Analysis, Data Mining, Information Retrieval or Knowledge Discovery. In this paper, we summarize and extend our work on different aspects of this branch of Web 2.0 research, demonstrated and evaluated within our own social bookmark and publication sharing system BibSonomy, which is currently among the three most popular systems of its kind. We structure this presentation along the different interaction phases of a user with our system, coupling the relevant research questions of each phase with the corresponding implementation issues. This approach reveals in a systematic fashion important aspects and results of the broad bandwidth of folksonomy research like capturing of emergent semantics, spam detection, ranking algorithms, analogies to search engine log data, personalized tag recommendations and information extraction techniques. We conclude that when integrating a real-life application like BibSonomy into research, certain constraints have to be considered; but in general, the tight interplay between our scientific work and the running system has made BibSonomy a valuable platform for demonstrating and evaluating Web 2.0 research.Wed Dec 15 11:28:44 CET 2010MultiMedia und Recht454-458Social Bookmarking-Systeme – die unerkannten Datensammler - Ungewollte personenbezogene Datenverabeitung?720102010 bibsonomy datenschutz info2.0 itegpub l3s myown privacy social-bookmarking spam Fri Sep 25 21:59:24 CEST 2009Workshop on Knowledge Discovery, Data Mining, and Machine Learningsep44 --51Testing and Evaluating Tag Recommenders in a Live System20092009 bibsonomy ecml l3s myown pkdd recommender tagging The challenge to provide tag recommendations for collaborative tagging systems has attracted quite some attention of researchers lately. However, most research focused on evaluation and development of appropriate methods rather than tackling the practical challenges of how to integrate recommendation methods into real tagging systems, record and evaluate their performance. In this paper we describe the tag recommendation framework we developed for our social bookmark and publication sharing system BibSonomy. With the intention to develop, test, and evaluate recommendation algorithms and supporting cooperation with researchers, we designed the framework to be easily extensible, open for a variety of methods, and usable independent from BibSonomy. Furthermore, this paper presents an evaluation of two exemplarily deployed recommendation methods, demonstrating the power of the framework.Fri Sep 25 21:58:12 CEST 2009New York, NY, USAHT '09: Proceedings of the 20th ACM Conference on Hypertext and Hypermediajun323--324Managing publications and bookmarks with BibSonomy20092009 bibsonomy ht09 l3s myown In this demo we present BibSonomy, a social bookmark and publication sharing system.Fri Jul 03 00:09:47 CEST 2009BonnInformatik 2006 -- Informatik für Menschen. Band 2octProc. Workshop on Applications of Semantic Technologies, Informatik 2006Lecture Notes in InformaticsEmergent Semantics in BibSonomyP-9420062006 UniK bibsonomy emergence emergent folksonomy hotho itegpub jaeschke l3s myown nepomuk schmitz semantics stumme tagorapub Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. The reason for their immediate success is the fact that no specific skills are needed for participating. In this paper we specify a formal model for folksonomies, briefly describe our own system BibSonomy, which allows for sharing both bookmarks and publication references, and discuss first steps towards emergent semantics.Tue Jun 10 22:32:17 CEST 2008Baden-BadenSocial Software in der WertschöpfungDas Entstehen von Semantik in BibSonomy20062006 BibSonomy UniK association bibsonomy folkrank folksonomies folksonomy hotho jaeschke nepomuk pagerank rules schmitz semantics semantik stumme tagging tagora tagorapub tags Immer mehr Soziale-Lesezeichen-Systeme entstehen im heutigen Web. In solchen Systemen erstellen die Nutzer leichtgewichtige begriffliche Strukturen, so genannte Folksonomies. Ihren Erfolg verdanken sie der Tatsache, dass man keine speziellen Fähigkeiten benötigt, um an der Gestaltung mitzuwirken. In diesem Artikel beschreiben wir unser System BibSonomy. Es erlaubt das Speichern, Verwalten und Austauschen sowohl von Lesezeichen (Bookmarks) als auch von Literaturreferenzen in Form von BibTeX-Einträgen. Die Entwicklung des verwendeten Vokabulars und der damit einhergehenden Entstehung einer gemeinsamen Semantik wird detailliert diskutiert.Fri Mar 28 17:54:33 CET 2008Journal of Web Semantics138-53Discovering Shared Conceptualizations in Folksonomies620082008 FCA OntologyHandbook analysis bibsonomy concept discovering fca folksonomies formal itegpub l3s myown shared triadic Fri Mar 28 12:11:30 CET 2008Proc. of the ICCS 2006 Conceptual Structures Tool Interoperability Workshop(to appear){BibSonomy}: A Social Bookmark and Publication Sharing System2006FCA OntologyHandbook bibsonomy bookmarking folksonomy iccs social Thu Dec 13 12:02:36 CET 2007Tracking User Attention in Collaborative Tagging Communities2007Communities Tagging User bibsonomy citeulike communities folksonomy tracking user Wed Dec 12 19:23:10 CET 2007Deliverable 15.2, European Network of Excellence ``Prolearn - Professional E-Learning''Case study on social software use in distributed working environments20072007 bibsonomy case itegpub myown social software study Wed Oct 31 14:01:46 CET 2007Berlin, HeidelbergProceedings of the 15th International Conference on Conceptual Structures (ICCS 2007)July283--295Lecture Notes in Artificial IntelligenceAnalysis of the Publication Sharing Behaviour in {BibSonomy}460420072007 BibSonomy bibsonomy bookmarking fca folksonomy iccs itegpub l3s myown publication sharing social trias BibSonomy is a web-based social resource sharing system which allows users to organise and share bookmarks and publications in a collaborative manner. In this paper we present the system, followed by a description of the insights in the structure of its bibliographic data that we gained by applying techniques we developed in the area of Formal Concept Analysis.Mon Jul 23 14:41:02 CEST 2007Banff, CanadaWorkshop on Social and Collaborative Construction of Structured Knowledge (CKC 2007) at WWW 2007Organizing Publications and Bookmarks in BibSonomy20072007 BibSonomy bibsonomy challenge itegpub l3s myown organizing tagorapub