Propagation of trust and distrust
Proceedings of the 13th international conference on World Wide Web
A framework to predict the quality of answers with non-textual features
SIGIR '06 Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval
Expertise networks in online communities: structure and algorithms
Proceedings of the 16th international conference on World Wide Web
Discovering authorities in question answer communities by using link analysis
Proceedings of the sixteenth ACM conference on Conference on information and knowledge management
Predictors of answer quality in online Q&A sites
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Knowledge sharing and yahoo answers: everyone knows something
Proceedings of the 17th international conference on World Wide Web
Crowdsourcing and knowledge sharing: strategic user behavior on taskcn
Proceedings of the 9th ACM conference on Electronic commerce
Predicting information seeker satisfaction in community question answering
Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval
Modeling information-seeker satisfaction in community question answering
ACM Transactions on Knowledge Discovery from Data (TKDD)
Questions in, knowledge in?: a study of naver's question answering community
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
How opinions are received by online communities: a case study on amazon.com helpfulness votes
Proceedings of the 18th international conference on World wide web
Evolution of two-sided markets
Proceedings of the third ACM international conference on Web search and data mining
Signed networks in social media
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Predicting positive and negative links in online social networks
Proceedings of the 19th international conference on World wide web
Predicting the popularity of online content
Communications of the ACM
Evaluating and predicting answer quality in community QA
Proceedings of the 33rd international ACM SIGIR conference on Research and development in information retrieval
Human Speed-Accuracy Tradeoffs in Search
HICSS '11 Proceedings of the 2011 44th Hawaii International Conference on System Sciences
Causal discovery in social media using quasi-experimental designs
Proceedings of the First Workshop on Social Media Analytics
Predicting the perceived quality of online mathematics contributions from users' reputations
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Predicting web searcher satisfaction with existing community-based answers
Proceedings of the 34th international ACM SIGIR conference on Research and development in Information Retrieval
Effects of user similarity in social media
Proceedings of the fifth ACM international conference on Web search and data mining
Exploiting user feedback to learn to rank answers in q&a forums: a case study with stack overflow
Proceedings of the 36th international ACM SIGIR conference on Research and development in information retrieval
Answering questions about unanswered questions of stack overflow
Proceedings of the 10th Working Conference on Mining Software Repositories
Estimating sharer reputation via social data calibration
Proceedings of the 19th ACM SIGKDD international conference on Knowledge discovery and data mining
Wisdom in the social crowd: an analysis of quora
Proceedings of the 22nd international conference on World Wide Web
Towards human-centric personalized expertise ranking in community-based question answering
Proceedings of the 2013 ACM SIGCOMM workshop on Future human-centric multimedia networking
Routing questions for collaborative answering in community question answering
Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining
Proceedings of the 2013 9th Joint Meeting on Foundations of Software Engineering
Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining
An empirical analysis of a network of expertise
Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining
CQArank: jointly model topics and expertise in community question answering
Proceedings of the 22nd ACM international conference on Conference on information & knowledge management
Fit or unfit: analysis and prediction of 'closed questions' on stack overflow
Proceedings of the first ACM conference on Online social networks
Slow Search: Information Retrieval without Time Constraints
Proceedings of the Symposium on Human-Computer Interaction and Information Retrieval
How social Q&A sites are changing knowledge sharing in open source software communities
Proceedings of the 17th ACM conference on Computer supported cooperative work & social computing
Specialization, homophily, and gender in a social curation site: findings from pinterest
Proceedings of the 17th ACM conference on Computer supported cooperative work & social computing
Collaborative problem solving: a study of MathOverflow
Proceedings of the 17th ACM conference on Computer supported cooperative work & social computing
Superposter behavior in MOOC forums
Proceedings of the first ACM conference on Learning @ scale conference
Information Sciences: an International Journal
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Question answering (Q&A) websites are now large repositories of valuable knowledge. While most Q&A sites were initially aimed at providing useful answers to the question asker, there has been a marked shift towards question answering as a community-driven knowledge creation process whose end product can be of enduring value to a broad audience. As part of this shift, specific expertise and deep knowledge of the subject at hand have become increasingly important, and many Q&A sites employ voting and reputation mechanisms as centerpieces of their design to help users identify the trustworthiness and accuracy of the content. To better understand this shift in focus from one-off answers to a group knowledge-creation process, we consider a question together with its entire set of corresponding answers as our fundamental unit of analysis, in contrast with the focus on individual question-answer pairs that characterized previous work. Our investigation considers the dynamics of the community activity that shapes the set of answers, both how answers and voters arrive over time and how this influences the eventual outcome. For example, we observe significant assortativity in the reputations of co-answerers, relationships between reputation and answer speed, and that the probability of an answer being chosen as the best one strongly depends on temporal characteristics of answer arrivals. We then show that our understanding of such properties is naturally applicable to predicting several important quantities, including the long-term value of the question and its answers, as well as whether a question requires a better answer. Finally, we discuss the implications of these results for the design of Q&A sites.