[1] “Wikipedia”, URL (last checked 23 April, 2012), http://en.wikipedia.org/wiki/Social_network_service, Internet Security Agency (2009). Survey of SNS membership status of the Internet users.
[2] T.J. Sung (2007). The Methodology of Research. Hakjisa..
[3] M.J. Kim and Y.J. Choi (2012). The Role of Twitter Online and Offline Relationship Formation, Korean Journal of Broadcasting, 26(1), 43-82.
[4] Ministry of Education, Science and Technology (2011). SMART Education Strategies.
[5] D.W. Johnson and R.T. Johnson (1992). Positive Interdependence: Key to Effective Cooperation. Interaction in cooperative groups, New York: Cambridge University Press.
[6] K. S. Noh, S. H. Ju, J. T. Jung (2011). An exploratory study on concept and realization conditions of smart learning, The journal of digital policy & management, 9(2), 79-88.
[7] J. H. Kang(2011) A study on utilizing SNS to vitalize smart learning. The journal of digital policy & management, 9(5), 265-274.