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Communities of Yahoo! Answers and Baidu Zhidao: Complementing or Competing?

Communities of Yahoo! Answers and Baidu Zhidao: Complementing or Competing?. Baichuan Li, Michael R. Lyu, and Irwin King Department of Computer Science and Engineering The Chinese University of Hong Kong. Community Question Answering. Complementing and Competing. Complementing

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Communities of Yahoo! Answers and Baidu Zhidao: Complementing or Competing?

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  1. Communities of Yahoo! Answers and Baidu Zhidao: Complementing or Competing? Baichuan Li, Michael R. Lyu, and Irwin King Department of Computer Science and Engineering The Chinese University of Hong Kong

  2. Community Question Answering

  3. Complementing and Competing • Complementing • Collaboration • Help each other on many topics • Competing • Isolation • Small circles

  4. Research Objects

  5. Data YA08 and BZ08 YA-Q and BZ-Q YA10 and BZ10 January, 2008 July 2010 May 2010

  6. Research Problems • Community structure • What’s it? • Sub-communities • User behaviors • Top contributors and common users • Influence to question solving

  7. Analysis • Social network analysis • Community structures • Sub-Community detection • User behavior analysis • Community efficiency analysis

  8. Community Structures SCC: users who frequently help each other IN: users who mainly ask questions OUT: users who mainly answer questions SCC: Strongly Connected Component DC: Disconnected Component

  9. Sub-Community Detection • Detecting Sub-communities • Louvain method (Blondel et al., 2008) 1 5 3 23 5 8 2 2 YA08 YA10 1 2 4 5 8 6 16 5 3 10 24 5 BZ08 BZ10 2 7 1 3

  10. Weighted Mean Entropy number of users in sub-community s number of categories number of questions user i asked (and/or) answered in category j Complementing Competing

  11. Behaviors of Top Contributors • Interaction between top contributors and their neighbors Collaboration YA08 YA10 Isolation BZ08 BZ10

  12. Behaviors of Top Contributors • Component of top contributors • Top 100 users ranked by Indegree, Outdegree, and Degree • Overlapping

  13. Behaviors of Common Users • Limited Activity • Most users only ask or answer questions in a very few categories

  14. Behaviors of Common Users • User activity at category level • Number of answers per question • Asker-answerer rate • Category mapping • 32 volunteers • Fleiss’ kappa • Similar category settings of YA and BZ

  15. Number of Answers per Question >

  16. Brief Summary • Similarities • Sub-communities are formed in both YA and BZ • Similar category settings • Differences Competing Complementing

  17. Discussion • Why? • Which style do you prefer? • Advertising? • Get good answers quickly? • How to improve community engagement? • Point system doesn’t work? • Monetary rewards? • What about the future? • Social QA?

  18. Community Efficiency • YA-Q and BZ-Q • 3,000 questions each are chosen randomly • Track the states of these questions within two days

  19. Conclusion • Reveal the communities of two leading CQA portals • Community structures • User behaviors • Temporal analysis • Yahoo! Answers: Complementing • Baidu Zhidao: Competing • Investigate the influence of community to the efficiency of question solving

  20. Future work • How to design better CQA systems? • High question solving speed • High user satisfactory • Encourage participation • Reward system • Impact of community on question and answer quality

  21. Thank You! Q&A

  22. BACKUP SLIDES

  23. Asker-Answerer Rate > >

  24. Closeness

  25. Category Mapping

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