3Wu, F. & Huberman, B. A, "Opinion Formation under Costly Expression," ACM Transactions on Intelligent Systems and Technology (TIST), Vol. 1, No. 1,2010, p. 5.
4Wahher, J. B. , De Andrea, D. , Kim, J. & Anthony, J. C. , "The Influence of Online Comments on Perceptions of Antimarijuana Public Service Announcements on YouTube," Human Communication Research, Vol. 36, No. 4, 2010, pp. 469-492.
5Thorson, K. , Dfiscoll, K. , Ekdale, B. , Edgerly, S. , Thompson, L. G. , Schrock, A. , et al. , "YouTube, Twitter and the Occupy Movement: Connecting Content and Circulation Practices," Information, Communication & Society, Vol. 16, No. 3, 2013, pp. 421-451.
6Bennett, W. L , & Segerberg, A. , "The Logic of Connective Action: Digital Media and the Personalization of Contentious Polities," Information, Communication& Society, Vol. 15, No. 5, 2012, pp. 739-768.
