A. Kes-erkul and R. E. Erkul, Web 2.0 in the process of e-participation: The case of organizing for america and the obama administration, 2009.

T. Vitvar, V. Peristeras, and K. Tarabanis, Semantic Technologies for E- Government, 2010.
DOI : 10.1007/978-3-642-03507-4

J. Krogstie, Citizens, from consumers to prosumers: e-government services typologies revisited, Proceedings of the NordicCHI'06 Workshop User Involvement and representation in e-Government projects, 2006.

J. P. Zappen, T. M. Harrison, and D. Watson, A new paradigm for designing egovernment: web 2.0 and experience design, Proceedings of the 2008 international conference on Digital government research, pp.17-26, 2008.

J. Cummings, Knowledge sharing: A review of the literature, 2003.

M. S. Granovetter, The Strength of Weak Ties, American Journal of Sociology, vol.78, issue.6, pp.1360-1380, 1973.
DOI : 10.1086/225469

M. W. Macy, Chains of Cooperation: Threshold Effects in Collective Action, American Sociological Review, vol.56, issue.6, pp.730-747, 1991.
DOI : 10.2307/2096252

P. E. Oliver and G. Marwell, The Paradox of Group Size in Collective Action: A Theory of the Critical Mass. II., American Sociological Review, vol.53, issue.1, pp.1-8, 1988.
DOI : 10.2307/2095728

R. Benbunan-fich and M. Koufaris, Motivations and Contribution Behaviour in Social Bookmarking Systems: An Empirical Investigation, Electronic Markets, vol.18, issue.2, pp.150-160, 2008.
DOI : 10.1080/10196780802044933

I. Y. Chen, N. S. Chen, and . Kinshuk, Examining the factors influencing participants knowledge sharing behavior in virtual learning communities, Educational Technology and Society, vol.12, issue.1, pp.134-148, 2009.

P. Cruickshank and C. F. Smith, Self-efficacy as a factor in the evaluation of epetitions, Proceedings of EDEM 2009 -Conference on Electronic Democracy, pp.223-232, 2009.

J. Palmisano, A Motivational Model of Knowledge Sharing, Handbook on Decision Support Systems 1, pp.355-370, 2008.
DOI : 10.1007/978-3-540-48713-5_18

C. M. Hoadley and P. G. Kilner, Using technology to transform communities of practice into knowledge-building communities, ACM SIGGROUP Bulletin, vol.25, issue.1, pp.31-40, 2005.
DOI : 10.1145/1067699.1067705

C. M. Chiu, M. H. Hsu, and E. T. Wang, Understanding knowledge sharing in virtual communities: An integration of social capital and social cognitive theories, Decision Support Systems, vol.42, issue.3, pp.1872-1888, 2006.
DOI : 10.1016/j.dss.2006.04.001

N. B. Peddibhotla and M. R. Subramani, Contributing to Public Document Repositories: A Critical Mass Theory Perspective, Organization Studies, vol.29, issue.5, pp.327-346, 2007.
DOI : 10.1177/0170840607076002

D. Tapscott and A. D. Williams, Wikinomics: How Mass Collaboration Changes Everything, 2006.

G. Beenen, K. Ling, X. Wang, K. Chang, D. Frankowski et al., Using social psychology to motivate contributions to online communities, Proceedings of the 2004 ACM conference on Computer supported cooperative work , CSCW '04, pp.212-221, 2004.
DOI : 10.1145/1031607.1031642

J. Arguello, B. S. Butler, E. Joyce, R. Kraut, K. S. Ling et al., Talk to me, Proceedings of the SIGCHI conference on Human Factors in computing systems , CHI '06, pp.959-968, 2006.
DOI : 10.1145/1124772.1124916

M. Burke, C. Marlow, and T. Lento, Feed me, Proceedings of the 27th international conference on Human factors in computing systems, CHI 09, pp.945-954, 2009.
DOI : 10.1145/1518701.1518847

T. Mann, Library research methods : a guide to classification, cataloging and computers, 1993.

J. Nahapiet and S. Ghoshal, Social capital, intellectual capital, and the organizational advantage, pp.242-266, 1998.

A. Ardichvili, V. Page, and T. Wentling, Motivation and barriers to participation in virtual knowledge???sharing communities of practice, Journal of Knowledge Management, vol.7, issue.1, pp.64-77, 2003.
DOI : 10.1108/13673270310463626

P. Hendriks, Why share knowledge? The influence of ICT on the motivation for knowledge sharing, Knowledge and Process Management, vol.6, issue.2, pp.91-100, 1999.
DOI : 10.1002/(SICI)1099-1441(199906)6:2<91::AID-KPM54>3.0.CO;2-M

J. Novak and M. Wurst, Supporting knowledge creation and sharing in communities based on mapping implicit knowledge, Journal of Universal Computer Science, vol.10, issue.3, pp.235-251, 2004.

H. Stuckenschmidt and F. V. Harmelen, Information Sharing on the Semantic Web, 2004.
DOI : 10.1007/b138282

V. Lanfranchi and N. Ireson, User requirements for a collective intelligence emergency response system, Proceedings of 23rd BCS HCI Group Conference, 2009.