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Bastos, B., Raimundo, R. and Travitzki, R. (2013). Gatekeeping Twitter: Message diffusion in political hashtags. Media, Culture & Society, 35(2), pp. 260-270. doi: 10.1177/0163443712467594
Bastos, M. T., Travitzki, R. and Puschmann, C. (2012). What Sticks with Whom? Twitter Follower-Followee Networks and News Classification. Paper presented at the The Sixth International AAAI Conference on Weblogs and Social Media (ICWSM 12), 4 Jun 2012, Dublin, Ireland.