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Discourse-aware rumour stance classification in social media using sequential classifiers
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Zubiaga, Arkaitz, Kochkina, Elena, Liakata, Maria, Procter, Rob, Lukasik, Michal, Bontcheva, Kalina, Cohn, Trevor and Augenstein, Isabelle (2018) Discourse-aware rumour stance classification in social media using sequential classifiers. Information Processing & Management, 54 (2). pp. 273-290. doi:10.1016/j.ipm.2017.11.009
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Official URL: http://doi.org/10.1016/j.ipm.2017.11.009
Abstract
Rumour stance classification, defined as classifying the stance of specific social media posts into one of supporting, denying, querying or commenting on an earlier post, is becoming of increasing interest to researchers. While most previous work has focused on using individual tweets as classifier inputs, here we report on the performance of sequential classifiers that exploit the discourse features inherent in social media interactions or 'conversational threads'. Testing the effectiveness of four sequential classifiers -- Hawkes Processes, Linear-Chain Conditional Random Fields (Linear CRF), Tree-Structured Conditional Random Fields (Tree CRF) and Long Short Term Memory networks (LSTM) -- on eight datasets associated with breaking news stories, and looking at different types of local and contextual features, our work sheds new light on the development of accurate stance classifiers. We show that sequential classifiers that exploit the use of discourse properties in social media conversations while using only local features, outperform non-sequential classifiers. Furthermore, we show that LSTM using a reduced set of features can outperform the other sequential classifiers; this performance is consistent across datasets and across types of stances. To conclude, our work also analyses the different features under study, identifying those that best help characterise and distinguish between stances, such as supporting tweets being more likely to be accompanied by evidence than denying tweets. We also set forth a number of directions for future research.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | H Social Sciences > HM Sociology Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software |
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| Divisions: | Faculty of Science > Computer Science | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | Rumor in mass media, Online social networks -- Social aspects, Social media, Data mining, Rumor, Natural language processing (Computer science) | |||||||||||||||
| Journal or Publication Title: | Information Processing & Management | |||||||||||||||
| Publisher: | Elsevier | |||||||||||||||
| ISSN: | 0306-4573 | |||||||||||||||
| Official Date: | March 2018 | |||||||||||||||
| Dates: |
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| Date of first compliant deposit: | 7 December 2017 | |||||||||||||||
| Volume: | 54 | |||||||||||||||
| Number: | 2 | |||||||||||||||
| Page Range: | pp. 273-290 | |||||||||||||||
| DOI: | 10.1016/j.ipm.2017.11.009 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| RIOXX Funder/Project Grant: |
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