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Wikis as Social Networks: Evolution and Dynamics

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Wikis as Social Networks: Evolution and Dynamics held at ACM SIG KDD SNA Workshop, Las Vegas, NV, August 24, 2008

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Wikis as Social Networks: Evolution and Dynamics

  1. 1. Ralf Klamma, Christian Haasler RWTH Aachen University SIG-KDD SNA Workshop, Henderson, NV August 24, 2008 Wikis as Social Networks: Evolution and Dynamics
  2. 2. Agenda <ul><li>Motivation: MediaBases </li></ul><ul><li>WikiWatcher System Design </li></ul><ul><li>Wiki Evolution & Dynamics </li></ul><ul><ul><li>Heterogeneity </li></ul></ul><ul><ul><li>Importance </li></ul></ul><ul><ul><li>Shortest Paths </li></ul></ul><ul><li>Conclusions & Outlook </li></ul>Agency & Patienthood in Digital Networks
  3. 3. Motivation: Cross-Media Dynamic Network Analysis <ul><li>Interdisciplinary multidimensional model of digital networks </li></ul><ul><ul><li>Dynamic network analysis (DNA) is defining measures for evolving social relations </li></ul></ul><ul><ul><li>Actor network theory (ANT) is connecting human and media agents </li></ul></ul><ul><ul><li>i* framework is defining changing strategic goals and dependencies </li></ul></ul><ul><ul><li>Theory of media transcriptions is studying cross-media knowledge </li></ul></ul><ul><li>Social Software </li></ul><ul><ul><li>Wiki, Blog, Podcast, IM, Chat, Email, Newsgroup, Chat … </li></ul></ul>i*-Dependencies (Structural, Cross-media) Members ( Social Network Analysis : Centrality, Efficiency) Network of Artifacts Microcontent, Blog entry , Message, Burst, Thread, Comment, Conversation, Feedback (Rating) Network of Members Communities of practice Media Networks
  4. 4. Motivation: MediaBases <ul><li>Collection of Social Software artifacts with parameterized PERL scripts </li></ul><ul><ul><li>Mailing lists </li></ul></ul><ul><ul><li>Wikis </li></ul></ul><ul><ul><li>Blogs </li></ul></ul><ul><ul><li>Many more </li></ul></ul><ul><li>Database support by IBM DB2, eXist, Oracle, ... </li></ul><ul><li>Web Interface based on Plone/Zope, LAS, ... </li></ul><ul><li>Strategies of visualization </li></ul><ul><ul><li>Tree maps </li></ul></ul><ul><ul><li>Cross-media graphs </li></ul></ul>Klamma et al.: Pattern-Based Cross Media Social Network Analysis for Technology Enhanced Learning in Europe , EC-TEL 2006 www.prolearn-academy.org
  5. 5. WikiWatcher – System Design article Article pages, URLS, Revisions Tim Liz Joe 123.45.67.89 Authors RDB Stage 1: SAX-based Parser in PERL Stage 2: Dynamic Analysis and Visualization Wiki Network Data Metadata [[Article]] [[requested]] article [http://…] [[Article2]] Generating XML dump/export files Parsing wiki data/ database transfer Measurement Network Analysis Generating Networks Visualization [[never exists]]
  6. 6. Network Heterogeneity <ul><li>Author Networks </li></ul><ul><ul><li>Author nodes (anonymous/registered users) </li></ul></ul><ul><ul><li>Edges represent collaboration between authors during a period t </li></ul></ul><ul><li>Article Networks </li></ul><ul><ul><li>Article nodes (incl. wiki namespaces) </li></ul></ul><ul><ul><li>Directed edges (links) between articles </li></ul></ul><ul><li>As expected both kind of networks stay heterogenous </li></ul>
  7. 7. Importance of Network Actors <ul><li>Articles: High betweenness centrality controls the flow of information within a Wiki </li></ul><ul><li>Betweenness values grow up or stay nearly constant during the evolution process </li></ul><ul><li>Determines </li></ul><ul><ul><li>Important actors </li></ul></ul><ul><ul><li>Important articles </li></ul></ul><ul><ul><li>Vandalism </li></ul></ul>
  8. 8. Evolution of Shortest Paths <ul><li>Densification Power Law: Complex networks may become denser during their growth </li></ul><ul><li>Generally this could not verified for wiki author networks! </li></ul><ul><li>The average distances stagnate at nearly 2 for all considered author networks </li></ul>
  9. 9. Evolution of Author Networks <ul><li>Strongly connected components merged by collaboration of two wiki authors </li></ul>Author Network of German Wikia in July 2007 Author Network of German Wikia in August 2007
  10. 10. Some more Hypotheses in the Study Hypotheses (Author Networks) Result Weakening of the new author rate Approved only in some Wikis Quick creation of author communities around articles Approved Authorial leadership [Reagle07] Approved Anonymous vs. registered author rate Approved only in some Wikis Registered authors connect anonymous authors Approved only in some Wikis Hypotheses (Article Networks) Result Weakening of new article rate Approved only in some Wikis Correlation between article size and #revisions Approved Weakening of article size growth Approved Correlation between article size and #discussions Approved only in some Wikis clustering coefficient of article nodes densifies Approved
  11. 11. Conclusions & Outlook <ul><li>WikiWatcher as part of an integrated MediaBase approach </li></ul><ul><li>Dynamic Social Network Analysis applicable for Wiki Networks (independent of Wiki Engines) </li></ul><ul><ul><li>Heterogeneous Author Collaboration & Article Networks </li></ul></ul><ul><ul><li>Dynamic Centrality Measures for Wiki Actors </li></ul></ul><ul><ul><li>Evolution of Shortest Paths in Wikis </li></ul></ul><ul><li>Outlook </li></ul><ul><ul><li>Cross-Media Integration </li></ul></ul><ul><ul><li>Explicit Strategic Modeling for Wiki Communities </li></ul></ul>

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