Claudia Wagner

Claudia Wagner


GESIS - Leibniz Institute for Social Sciences, Computational Social Science Department
Unter Sachsenhausen 5-7, 50667 Cologne, Germany
Phone: +49-221-47694-224
Skype: clauwag
Email: claudia dot wagner at gesis dot org OR clwagner at uni-koblenz dot de

Interests:
Computational Social Science, Data and Text Mining, Network theory and dynamics, Web Science


Brief Bio:

Currently I am a Post Doctoral Researcher at the Computational Social Science Department at GESIS - Leibniz Institute for the Social Sciences and an Adjunct Lecturer at the University of Koblenz-Landau. My work focuses around exploring to what extent digital traces can be used to learn about the interests, knowledge, habits and biases of individuals and social groups and how new technologies may impact them. My research interests include data mining, natural language processing and social and behavioural theories.

Previously, I did my master and my PhD in Computer Science at Graz University of Technology and worked as a research assistant at JOANNEUM RESEARCH in Graz, Austria. From February 2013 until April 2013 I was interning at HP labs where I was part of the Social Computation Research group. In summer 2011, I worked at the Augmented Social Cognition Group at Xerox PARC where I worked with Les Nelson and Peter Pirolli on creating topical expertise model of Twitter users. From October 2008 to February 2009 and in March and April 2011, I was an intern at the Knowledge Media Institute (KMi), Open University, where I worked with Enrico Motta, Matthew Rowe and Harith Alani on analyzing relations between different types of user activities and semantics.

Post-Doctoral Research:

Recent years have witnessed a big data boom that manifests, amongst others, in an increasing amount of data and content that is directly or indirectly generated by users of socio-computational systems. Socio-computational systems are systems where users create content and the collective behavior of users is used to filter, retrieve, and recommend content, items and contacts (e.g., Digg.com, Google, Wikipedia, Facebook, Twitter). This new type of data provides new opportunities and challenges to humanities and social sciences that aim to understand how people think/feel/behave in social situations (social psychology), relate to each other (sociology), govern themselves (political science), handle wealth (socio-economics) and create culture (anthropology).

My post doctoral research aims (1) to investigate to what extent and how this new type of data (e.g., user generated content, server log data or search query logs) that is impacted and shaped by many factors, including algorithms and computational methods in general, can be used to address social science research questions and (2) to develop computational methods that enable the investigation and exploitation of this data. The exploitation of this new type of data requires not only data mining, natural language, image and video processing methods, but also a deep understanding of the social and the algorithmic forces that impact how people behave in socio- computational systems.

I am also interested in measuring and assessing the potential impact of socio-computational systems on society, especially in the context of social inequalities, and the potential value of these systems for future historians. How do social inequalities manifest online and which factors exaggerate them? How can we assess the societal consequences of algorithms and systems? What type of social data should be preserved for the next generations and how?

PhD Research:

Social streams are aggregations of data that are produced by temporal sequences of users' activities in socio-computational systems like Twitter or Facebook where others can perceive the manifestation of these activities and social and algorithmic forces determine how items are displayed. Although previous research has shown that social streams are a useful source for many types of information (including the assessment of damage after disasters like earthquakes or of opinions or attitudes towards certain subjects), most existing approaches at that point in time treated social streams as collections of text snippets and neglected the fact that social streams emerge through user activities.

My PhD thesis explored relations between user activities which generate a stream (and therefore impact the emergent structure of that stream) and the semantics of that stream and proposed novel approaches for incorporating user behavior into the text mining process. I introduced a network-theoretic model of social streams which enables the formal description of social streams and the structures that emerge from them.

Grants and Awards :

  • 06/2014 Best Paper Award at the 8th International Conference on Weblogs and Social Media (ICWSM 2014)
  • 09/2012 Best Paper Award at ASE/IEEE International Conference on Social Computing (SocialCom 2012)
  • 02/2011 - 10/2013 DOC-fFORTE fellowship (~80.000 EUR)
  • 05/2010 Best Student Paper Award at 7th Extended Semantic Web Conference (ESWC2010)
  • 09/2008 - 03/2009 Forschung Austria fellowship (~5.000 EUR)

Teaching:

  • Computational Social Science at the University of Koblenz, SS 2014/15 (slides)
  • Introduction to Data Science, WebScience Summer School, Southampton, UK (slides and video)
  • Computational Social Science at the University of Koblenz, SS 2013/14 (slides)

Invited Talks:

  • Inequalities and Biases in socio-technical systems, Invited Slam at the first Science Slam at the International AAAI Conference on Web and Social Media (ICWSM 2015), May 2015, Oxford, UK (slides)
  • Gender Inequality in Wikipedia, Wikimedia Foundation, March 2015, Berlin, Germany.(slides)
  • Food and Culture, Yahoo Labs, November 2014, Barcelona, Spain (slides)
  • Food and Culture, Telefonica I+D, November 2014, Barcelona, Spain
  • Food and Culture - CSS Research @GESIS, Indiana University, Network Science Institute, October 2014, Bloomington, IN, USA
  • Extracting Semantics from User Generated Content, SONIC Speaker Series, Northwestern University, May 2012, Evanston, MI, USA.(audio)

Publications:

Journals:

  • Claudia Wagner, Philipp Singer and Markus Strohmaier, The Nature and Evolution of Online Food Preferences, EPJ Data Science Journal (pdf)
  • Markus Strohmaier and Claudia Wagner, Computational Social Science for the World Wide Web, IEEE Intelligent Systems 29(5): 84-88, 2014 (pdf)
  • Claudia Wagner, Philipp Singer, Markus Strohmaier and Bernardo Huberman, Semantic Stability and Implicit Consensus in Social Tagging Streams, IEEE Transactions on Computational Social Systems, Volume 1, Issue 1, pp. 108-120, March 2014. (pdf)

Conferences:

  • Claudia Wagner, David Garcia, Mohsen Jadidi and Markus Strohmaier, It's a Man's Wikipedia? Assessing Gender Inequality in an Online Encyclopedia, The International AAAI Conference on Web and Social Media (ICWSM2015) (pdf) (Press) (acceptance rate 18.37%)
  • Claudia Wagner and Luca Aiello, Men eat on Mars, Women on Venus? An Empirical Study of Food-Images, Poster at ACM Web Science, Oxford, 2015. (pdf)
  • Paul Laufer, Claudia Wagner, Fabian Flöck and Markus Strohmaier, Mining cross-cultural relations from Wikipedia - A study of 31 European food cultures, ACM Web Science, Oxford, 2015. Best Paper Award (pdf)
  • Haiko Lietz, Claudia Wagner, Arnim Bleier, and Markus Strohmaier, When Politicians Talk: Assessing Online Conversational Practices of Political Parties on Twitter, The International AAAI Conference on Weblogs and Social Media (ICWSM 2014), Ann Arbor, MI, US, 2014. Best Paper Award ) (pdf) (acceptance rate 22.93%)
  • Claudia Wagner, Philipp Singer, Bernardo Huberman and Markus Strohmaier, Semantic Stability in Social Tagging Streams, World Wide Web conference (WWW2014), Korea, 2014. (pdf) (acceptance rate 12.92\%)
  • Claudia Wagner, Philipp Singer and Markus Strohmaier, Spatial and Temporal Patterns of Online Food Preferences, World Wide Web conference (WWW2014), Korea, 2014. (pdf)
  • Claudia Wagner, Sitaram Asur and Joshua Hailpern, Religious Politicians and Creative Photographers: Automatic User Categorization in Twitter, ASE/IEEE International Conference on Social Computing (SocialCom), Washington DC, US, 2013. (pdf)
  • Johannes Schantl, Claudia Wagner, Rene Kaiser and Markus Strohmaier, The Utility of Social and Topical Factors in Anticipating Repliers in Twitter Conversations, ACM Web Science, Paris, France, 2013. (pdf)
  • Silvia Mitter, Claudia Wagner and Markus Strohmaier, Understanding The Impact Of Socialbot Attacks In Online Social Networks, ACM Web Science, Paris, France, 2013. (pdf)
  • Silvia Mitter, Claudia Wagner and Markus Strohmaier, A Categorization Scheme for Socialbot Attacks In Online Social Networks, ACM Web Science, Paris, France, 2013. (pdf)
  • Claudia Wagner, Philipp Singer, Lisa Posch and Markus Strohmaier, The Wisdom of the Audience: An Empirical Study of Social Semantics in Twitter Streams, European Semantic Web Conference (ESWC), Montpellier, France, 2013. (pdf) (acceptance rate 25.93\%)
  • Matthew Rowe, Claudia Wagner, Markus Strohmaier and Harith Alani, Measuring the Topical Specificity of Online Communities, European Semantic Web Conference (ESWC), Montpellier, France, 2013. (pdf)
  • Felix Weninger, Claudia Wagner, Martin Wöllmer, Björn Schuller, Louis-Philippe Morency, Speaker Trait Characterization in Web Videos: Uniting Speech, Language, and Facial Features, 38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Vancouver, Canada, 2013. (pdf)
  • Claudia Wagner, Matthew Rowe, Markus Strohmaier and Harith Alani, Ignorance isn't Bliss: An Empirical Analysis of Attention Patterns in Online Communities, ASE/IEEE International Conference on Social Computing (SocialCom2012), Amsterdam, The Netherlands, 2012. Best Paper Award (pdf) (acceptance rate 23%)
  • Claudia Wagner, Vera Liao, Peter Pirolli, Les Nelson and Markus Strohmaier, It's not in their tweets: Modeling topical expertise of Twitter users, ASE/IEEE International Conference on Social Computing (SocialCom2012), Amsterdam, The Netherlands, 2012. (pdf) (acceptance rate 23%)
  • Claudia Wagner, Matthew Rowe, Markus Strohmaier and Harith Alani, What catches your attention? An empirical study of attention patterns in community forums, Poster at the International AAAI Conference on Weblogs and Social Media (ICWSM 2012), Dublin, Ireland, 2012. (pdf)
  • Vera Liao, Claudia Wagner, Peter Pirolli and Wai-Tat Fu, Understanding Experts' and Novices' Expertise Judgment of Twitter Users, ACM SIGCHI Conference on Human Factors in Computing Systems (CHI 2012), Texas, Austin, 2012. (pdf)
  • Peter Kraker, Claudia Wagner, Fleur Jeanquartier and Stefanie N. Lindstaedt, On the Way to a Science Intelligence: Visualizing TEL Tweets for Trend Detection, Sixth European Conference on Technology Enhanced Learning (EC-TEL 2011), Palermo, Italy, 2011. (pdf)
  • Stefanie Lindstaedt and Viktoria Pammer and Roland Mörzinger and Roman Kern and Helmut Mülllner and Claudia Wagner, Recommending tags for pictures based on text, visual content and user context, Third International Conference on Internet and Web Applications and Services (ICIW 2008), Athens, Greece, 2008. (pdf)
  • Alexander Stocker, Anwar Us Saed, Gisela Dösinger and Claudia Wagner, The Three Pillars of Corporate Web 2.0: A Model for Definition, Triple-I, Graz, Austria 2007. (pdf)

Workshops:

  • Claudia Wagner, Silvia Mitter, Christian Körner and Markus Strohmaier, When social bots attack: Modeling susceptibility of users in online social networks, 2nd workshop on Making Sense of Microposts at WWW2012, Lyon, France, 2012. (pdf)
  • Philipp Singer, Claudia Wagner and Markus Strohmaier, Understanding co-evolution of social and content networks on Twitter, 2nd workshop on Making Sense of Microposts at WWW2012, Lyon, France, 2012. (pdf)
  • Claudia Wagner, Markus Strohmaier and Yulan He, Pragmatic metadata matters: How data about the usage of data effects semantic user models, Social Data on the Web Workshop co-located with 10th International Semantic Web Conference (ISWC2011), Bonn, Germany, 2011. (pdf)
  • Claudia Wagner, Exploring the Wisdom of the Tweets: Towards Knowledge Acquisition from Social Awareness Streams, PhD Symposium at 7th Extended Semantic Web Conference (ESWC2010), Kreta, Greece, 2010. (Best Student Paper)(pdf)
  • Claudia Wagner and Markus Strohmaier, The Wisdom in Tweetonomies: Acquiring Latent Conceptual Structures from Social Awareness Streams, Semantic Search Workshop at WWW2010, Raleigh, US, 2010. (pdf)
  • Milan Stankovic, Claudia Wagner, Jelena Jovanovic and Philippe Laublet, Looking for Experts? What can Linked Data do for You?, Linked Data on the Web Workshop at WWW2010, Raleigh, US, 2010. (pdf)
  • Claudia Wagner, Peter Scheir, Alexander Stocker and Wolfgang Halb, Harnessing semantic web technologies for solving the dilemma of content providers, I-SEMANTICS, Graz, Austria 2010. (pdf)
  • Claudia Wagner and Enrico Motta, Data Republishing on the Social Semantic Web, Trust and Privacy on the Social and Semantic Web Workshop at ESWC2009, Kreta, Greece, 2009. (pdf)
  • Atif Latif, Anwar Us Saeed, Patrick Hoefler, Alexander Stocker and Claudia Wagner, The Linked Data Value Chain: A Lightweight Model for Business Engineers, I-SEMANTICS, Graz, Austria 2009. (pdf)
  • Claudia Wagner, Controlled Cross-Community Data Sharing, Poster at The Seventh Summer School on Ontological Engineering and the Semantic Web, Cercedilla, Spain, 2009. (pdf)

PhD thesis:

  • Claudia Wagner, Emergent Structure, Semantics and Usage of Social Streams, PhD Thesis, 2013. (pdf)

Services:

Chair:

  • Program Chair of the International Conference on Web and Social Media 2016 Program Chair at ICWSM 2016
  • Workshop Chair of the International Conference on Web and Social Media 2015 Workshop Chair at ICWSM 2015
  • Organizer of GESIS CSS Seminar
  • Organizer of Computational Approaches to Social Modeling Workshop (ChASM) , at ACM Web Science conference, June 2014, Bloomington, IN, USA
  • Journal Reviewer:

  • Reviewer of the Frontiers in Physics: At the crossroads: lessons and challenges in Computational Social Science
  • Reviewer for the journal:Social Networks - An International Journal of Structural Analysis
  • Reviewer for the Journal of the American Society for Information Science and Technology
  • Reviewer for the Journal of Web Semantics
  • Reviewer of the Journal Semantic Web: Interoperability, Usability, Applicability
  • Program Committee (Conferences):

  • PC of World Wide Web Conference 2015 (WWW2015), Crowdsourcing Systems and Social Media track and Web Science track
  • PC of the International Conference on Web and Social Media 2015 (ICWSM2015)
  • PC of the International Conference on Computational Social Science (ICCSS2015)
  • PC of the Extended Semantic Web Conference (ESWC 2015)
  • PC of the ACM Hypertext conference, 2015
  • PC of the 6th International Conference on Social Informatics (SocInfo 2014)
  • PC of the ACM Web Science conference (WebSci 2014)
  • PC of the Sixth ASE International Conference on Social Computing (SocialCom 2014)
  • PC of the Web Science Track at Word Wide Web Conference (WWWW 2014)
  • PC of the IEEE International Conference on Cyber, Physical and Social Computing
  • PC of the Poster and Demo Track of the Extended Semantic Web Conference (ESWC 2013)
  • PC of the International Semantic Web Conference (ISWC 2013)
  • PC of AAAI 2012 , AI and Web Track
  • PC of the ACM Hypertext 2011, Social Media Track
  • PC of the 9th International Conference on Knowledge Management and Knowledge Technologies (I-KNOW 2009)
  • Program Committee (Workshops):

  • PC of the 6th International Workshop on Modeling Social Media - Behavioral Analytics in Social Media, Big Data and the Web at WWW 2015
  • PC of the Connecting Online and Offline Worlds Workshop (COOL) at WWWW 2014
  • PC of the Mining, Modeling and Recommending 'Things' in Social Media Workshop (MSM'13)
  • PC of the Positive and Negative Sides of Social Media Workshop (Pansom2013)
  • PC of the 3rd Workshop on Making Sense of Microposts (MSM2013) at WWW 2013
  • PC of the 1st International Workshop on Multimodal Crowd Sensing at CIKM 2012
  • PC of the 2nd workshop on Making Sense of Microposts (MSM2012)at WWW2012
  • PC of the 1st International Workshop on Knowledge Extraction and Consolidation from Social Media at ISWC2012
  • PC of the User Profile Data on the Social Semantic Web co-located with ESWC2011
  • PC of the Personal Semantic Data on the Desktop and on the Web co-located with ESWC2011
  • PC of the Making Sense of Microposts Workshop(MSM2011) co-located with ESWC2011
  • PC of the 1st Workshop on Trust and Privacy on the Social and Semantic Web(SPOT2010) co-located with ESWC2010
  • PC of the Social Networks Interoperability, 1st International Workshop 2009(SNI2009)
  • Videos:

    The Wisdom of the Audience: An Empirical Study of Social Semantics in Twitter Streams, 10th Extended Semantic Web Conference (ESWC), May 2013, Montpellier, France.


    Introduction to Data Science, WebScience Summer School , July 2014, Southampton, UK.


    Extracting Semantics from User Generated Content, SONIC Speaker Series, Northwestern University, May 2012, Evanston, MI, USA.