M. Bastian, S. Heymann, and M. Jacomy, Gephi: An open source software for exploring and manipulating networks, International AAAI Conference on Weblogs and Social Media, pp.361-362, 2009.

M. Beguerisse-diaz, G. Garduno-hernandez, B. Vangelov, S. N. Yaliraki, and M. Barahona, Interest communities and flow roles in directed networks: the Twitter network of the UK riots, Journal of The Royal Society Interface, vol.17, issue.5500, 2014.
DOI : 10.1126/science.290.5500.2319

J. Boyadjian, Twitter, un nouveau " baromètre de l'opinion publique " ? Participations, pp.55-74, 2014.
DOI : 10.3917/parti.008.0055

A. Casilli and P. Tubaro, Social Media Censorship in Times of Political Unrest - A Social Simulation Experiment with the UK Riots, Bulletin of Sociological Methodology/Bulletin de M??thodologie Sociologique, vol.115, issue.1, pp.5-20, 2012.
DOI : 10.1177/0759106312445697

URL : https://hal.archives-ouvertes.fr/hal-00682317

D. Darmon, E. Omodei, and J. Garland, Followers Are Not Enough: A Multifaceted Approach to Community Detection in Online Social Networks, PLOS ONE, vol.6, issue.8, 2015.
DOI : 10.1371/journal.pone.0134860.s001

M. Duggan, N. B. Ellison, C. Lampe, A. Lenhart, and M. Madden, Social media update 2014. Pew Research Center. Retrieved from http, 2015.

L. Freeman, Centrality in social networks conceptual clarification, Social Networks, vol.1, issue.3, pp.215-2390378, 1978.
DOI : 10.1016/0378-8733(78)90021-7

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.227.9549

M. Grandjean, Introduction à la visualisation de données: l'analyse de réseau en histoire, Geschichte und Informatik, vol.18, pp.109-128, 2015.
URL : https://hal.archives-ouvertes.fr/halshs-01525543

M. Grandjean, THATCamp geography, 2015.
URL : http://www.martingrandjean.ch/ data-visualization-thatcamp-geography

M. Grandjean and Y. Rochat, The digital humanities network on Twitter (#DH2014), 2014.
URL : http://www.martingrandjean.ch/dataviz-digital-humanities-twitter-dh2014/

S. A. Hale, Global connectivity and multilinguals in the Twitter network, Proceedings of the 32nd annual ACM conference on Human factors in computing systems, CHI '14, pp.833-842, 2014.
DOI : 10.1145/2556288.2557203

S. Haustein, I. Peters, C. R. Sugimoto, M. Thelwall, and V. Larivière, Tweeting biomedicine: An analysis of tweets and citations in the biomedical literature, Journal of the Association for Information Science and Technology, vol.494, issue.5, pp.656-669, 2014.
DOI : 10.1002/asi.23101

J. Jussila, J. Huhtamaki, K. Henttonen, H. Karkkainen, and K. Still, Visual Network Analysis of Twitter Data for Co-organizing Conferences: Case CMAD 2013, 2014 47th Hawaii International Conference on System Sciences, pp.1474-1483, 2014.
DOI : 10.1109/HICSS.2014.190

S. Milgram, The small-world problem, Psychology Today, vol.2, pp.60-67, 1967.
DOI : 10.1037/e400002009-005

C. Miller, S. Ginnis, R. Stobart, A. Krasodomski-jones, and M. Clemence, The road to representivity, a Demos and Ipsos MORI report on sociological research using Twitter, 2015.

A. Mislove, S. L. Jorgensen, Y. Ahn, J. Onnela, and J. N. Rosenquist, Understanding the demographics of Twitter users, International AAAI Conference on Weblogs and Social Media, pp.554-557, 2011.

S. A. Myers, A. Sharma, A. Gupta, and J. Lin, Information network or social network? The structure of the Twitter follow graph, Proceedings of the Companion Publication of the 23rd International Conference on World Wide Web Companion, pp.493-498, 2014.

M. J. Newman, Networks, 2010.
DOI : 10.1093/acprof:oso/9780199206650.001.0001

Y. Rochat, Character networks and centrality (Thesis), 2014.

T. Sakaki, M. Okazaki, and Y. Matsuo, Earthquake shakes Twitter users, Proceedings of the 19th international conference on World wide web, WWW '10, pp.851-860, 2010.
DOI : 10.1145/1772690.1772777

L. Sloan, J. Morgan, W. Housley, M. Williams, A. Edwards et al., Knowing the Tweeters: Deriving Sociologically Relevant Demographics from Twitter, Sociological Research Online, vol.18, issue.3, pp.1-11, 2013.
DOI : 10.5153/sro.3001

K. Stepanyan, K. Borau, and C. Ullrich, A Social Network Analysis Perspective on Student Interaction within the Twitter Microblogging Environment, 2010 10th IEEE International Conference on Advanced Learning Technologies, pp.70-72, 2010.
DOI : 10.1109/ICALT.2010.27

S. Stieglitz and L. Dang-xuan, Political Communication and Influence through Microblogging--An Empirical Analysis of Sentiment in Twitter Messages and Retweet Behavior, 2012 45th Hawaii International Conference on System Sciences, pp.3500-3509, 2012.
DOI : 10.1109/HICSS.2012.476

K. Subbian and P. Melville, Supervised Rank Aggregation for Predicting Influencers in Twitter, 2011 IEEE Third Int'l Conference on Privacy, Security, Risk and Trust and 2011 IEEE Third Int'l Conference on Social Computing, pp.661-665, 2011.
DOI : 10.1109/PASSAT/SocialCom.2011.167

B. Suh, L. Hong, P. Piroll, and E. H. Chi, Want to be Retweeted? Large Scale Analytics on Factors Impacting Retweet in Twitter Network, 2010 IEEE Second International Conference on Social Computing, pp.177-184, 2010.
DOI : 10.1109/SocialCom.2010.33

M. E. Terras and J. Huhtamäki, Present, Not Voting, pp.165-183, 2010.
DOI : 10.1057/9780230371934.0014

D. J. Watts and S. H. Strogatz, Collective dynamics of 'small-world' networks, Nature, vol.393, issue.6684, pp.440-442, 1998.
DOI : 10.1038/30918