Bo Xu (SONIC alum), Yun Huang and Noshir Contractor published an article titled “Exploring Twitter networks in parallel computing environments”


Xu, B., Huang, Y., & Contractor, N. (2013). Exploring Twitter networks in parallel computing environments. Presented at the XSEDE ’13: Proceedings of the Conference on Extreme Science and Engineering Discovery Environment: Gateway to Discovery,  ACM  Request Permissions. doi:10.1145/2484762.2484811


Millions of users follow each other on Twitter and form a large and complex network. The size of the network creates statistical and computational challenges on exploring and examining individual behavior on Twitter. Using a sample of 697,628 Korean Twitter users and 34 million relations, this study investigates the patterns of unfollow behavior on Twitter, i.e. people removing others from their Twitter follow lists. We use Exponential Random Graph Models (p*/ERGMs) and Statnet in R to examine the impacts of reciprocity, status, embeddedness, homophily, and informativeness on tie dissolution. We perform data processing, statistics calculation, network sampling, and Markov chain Monte Carlo (MCMC) simulation on Gordon, a unique supercomputer at the San Diego Supercomputer Center (SDSC). The process demonstrates the role of advanced computing technologies in social science studies.

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