2019
DOI: 10.1177/0081175019860244
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CASM: A Deep-Learning Approach for Identifying Collective Action Events with Text and Image Data from Social Media

Abstract: Protest event analysis is an important method for the study of collective action and social movements and typically draws on traditional media reports as the data source. We introduce collective action from social media (CASM)—a system that uses convolutional neural networks on image data and recurrent neural networks with long short-term memory on text data in a two-stage classifier to identify social media posts about offline collective action. We implement CASM on Chinese social media data and identify more… Show more

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Cited by 134 publications
(108 citation statements)
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References 97 publications
(97 reference statements)
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“…For example, the term "epidemic" is used by both Weibo-COV and Weiboscope to collect data, but in some posts "epidemic" refers to other outbreaks, such as the pneumonic plague. As the number of keywords expands, recall will increase but precision will decrease (Zhang and Pan, 2019), and that is what we observe: Weibo-COV contains more false positives than Weiboscope since Weibo-COV uses a substantially higher number of keywords. This is why it is crucial for the validity of our findings that we apply our machine learning classifier to identify COVID-related posts.…”
Section: Resultssupporting
confidence: 66%
See 1 more Smart Citation
“…For example, the term "epidemic" is used by both Weibo-COV and Weiboscope to collect data, but in some posts "epidemic" refers to other outbreaks, such as the pneumonic plague. As the number of keywords expands, recall will increase but precision will decrease (Zhang and Pan, 2019), and that is what we observe: Weibo-COV contains more false positives than Weiboscope since Weibo-COV uses a substantially higher number of keywords. This is why it is crucial for the validity of our findings that we apply our machine learning classifier to identify COVID-related posts.…”
Section: Resultssupporting
confidence: 66%
“…Doing so can have substantive payoffs. For example, scholars of Chinese politics have noted a seeming disconnect between surveys showing high levels of political trust in China and analyses of Chinese social media data showing high frequencies of protest and discontent (Cai, 2010;Chen, 2012;Heurlin, 2020;King et al, 2013;Zhang and Pan, 2019). However, survey-based designs often, by default, incorporate both positive and negative sentiments.…”
Section: Discussionmentioning
confidence: 99%
“…It is testable in 26 markets, and the entry pattern in 22 markets is as predicted. 17 Under random entry, the probability of such an outcome is 2 in 10,000.…”
Section: B Sequence Of Newspaper Entrymentioning
confidence: 99%
“…Likewise, the social media data that has contributed the largest part of the events in this study have emerged as the source with by far the largest coverage of events and the fewest relative biases in data from China. 55 Censorship introduces another layer of potential bias. The following attributes of the data, however, minimize this effect.…”
Section: Data Validitymentioning
confidence: 99%