wikis as social networks:evolution and dynamics
DESCRIPTION
Wikis as Social Networks:Evolution and Dynamics held at ACM SIG KDD SNA Workshop, Las Vegas, NV, August 24, 2008TRANSCRIPT
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-1
CUELC
Ralf Klamma, Christian Haasler
RWTH Aachen University
SIG-KDD SNA Workshop, Henderson, NV
August 24, 2008
Wikis as Social Networks:Evolution and Dynamics
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-2
CUELC
Agenda
Motivation: MediaBases WikiWatcher System Design Wiki Evolution &
Dynamics– Heterogeneity– Importance– Shortest Paths
Conclusions & Outlook
Agency & Patienthood in Digital Networks
Agency & Patienthood in Digital Networks
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-3
CUELC
Motivation:Cross-Media Dynamic Network Analysis
Interdisciplinary multidimensional model of digital networks– Dynamic network analysis (DNA) is defining measures for evolving
social relations– Actor network theory (ANT) is connecting human and media agents– i* framework is defining changing strategic goals and dependencies – Theory of media transcriptions is studying cross-media knowledge
Social SoftwareWiki, Blog, Podcast, IM, Chat, Email, Newsgroup, Chat …
i*-Dependencies(Structural, Cross-media)
Members(Social Network Analysis: Centrality,
Efficiency)
Network of ArtifactsMicrocontent, Blog entry, Message, Burst, Thread,
Comment, Conversation, Feedback (Rating)
Network of Members
Communities of practice
Media Networks
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-4
CUELC
Motivation:MediaBases
Collection of Social Software artifacts with parameterized PERL scripts– Mailing lists– Wikis– Blogs– Many more
Database support by IBM DB2, eXist, Oracle, ...
Web Interface based on Plone/Zope, LAS, ...
Strategies of visualization– Tree maps– Cross-media graphs
Klamma et al.: Pattern-Based Cross Media Social Network Analysis for Technology Enhanced Learning in Europe, EC-TEL 2006
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-5
CUELC
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 XMLdump/export files
Parsing wiki data/database transfer
Measurement
Network Analysis
Generating Networks
Visualization
[[never exists]]
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-6
CUELC
Network Heterogeneity
Author Networks– Author nodes
(anonymous/registered users)– Edges represent collaboration
between authors during a period t
Article Networks– Article nodes
(incl. wiki namespaces)– Directed edges (links)
between articles As expected both kind of
networks stay heterogenous
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-7
CUELC
Importance of Network Actors
Articles: High betweenness centrality controls the flow of information within a Wiki
Betweenness values grow up or stay nearly constant during the evolution process
Determines– Important actors– Important articles– Vandalism
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-8
CUELC
Evolution of Shortest Paths
Densification Power Law: Complex networks may become denser during their growth
Generally this could not verified for wiki author networks!
The average distances stagnate at nearly 2 for all considered author networks
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-9
CUELC
Evolution of Author Networks Strongly connected components merged by collaboration of
two wiki authors
Author Network of German Wikia in July 2007 Author Network of German Wikia in August 2007
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-10
CUELC
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
Lehrstuhl Informatik V(Informationssysteme)
Prof. Dr. M. JarkeI5-RK-0808-11
CUELC
Conclusions & Outlook
WikiWatcher as part of an integrated MediaBase approach
Dynamic Social Network Analysis applicable for Wiki Networks (independent of Wiki Engines)– Heterogeneous Author Collaboration & Article Networks– Dynamic Centrality Measures for Wiki Actors– Evolution of Shortest Paths in Wikis
Outlook– Cross-Media Integration– Explicit Strategic Modeling for Wiki Communities