- Boyd, D & Ellison, N. (2007). Social Network Site: Definition, History and Scholarship. Journal of Computer-Mediated Communication. Vol. 133, pp. 210-230.
- Castells, Manuel (2000). The Rise of the Network Society. The Information Age: Economy, Society and Culture. Volume 1. Malden: Blackwell. Second Edition. p. 21, 500.
- Elo, Satu & Kyngas, Helvi (2007). The Qualitative Content Analysis Process. Journal of Advanced Nursing. 2008. Wiley online liberary.
- Groom, N. (2012, September 7). "Obama sets Twitter record with strring DNC speech". Hujffington Post. Retrieved from
http:// www.huffingtonpost.com.
- Guilenberg, Jan Van & Slaa .Paul. (1993). "From Media Policy towards a National Communication Policy: Broadening the Scope". European Journal ofCommunication, 8 (2).
- Holloway, Immy. & Wheeler, Stephanie. (1996). Qualitative research in Nursing. London: Blackwell.
- Kohlbacher, Florian. (2006). the Use of Qualitative Content Analysis in Case Study Research. In Qualitative Social Research. Volume 7. No 1.
- Lee, D. (2012, November 7). Obama Posts record-breaking tweet. BBC. Retrieved from
http://www.bbc.co.uk.
- Sassen, S. (2000). Digital Networks and the State: Some Governance Questions. Theory Culture & Society. 17 (4), 19-33. Retrieved from http;//tcs.sagepub.com.
- Van Dijk, J. (2005). The Deepening Divide: Inequality in the Information Society. London: sage
- Wilkinson, David & Birmingham, Poter. (2003). Using Research Instruments: A Guide for Researchers. London: Routledge.