1[1]John Dewey.Democracy and education[M].New York:Macmillan,1916.
2[2]E-learning in the 21st century:a framework for research and practice Guidelines for practice,in D.R.Garrison and Terry Anderson,RoutledgeFalmer press,2003.
3[3]Terry Anderson,Liam Rourke,D.Randy Garrison Walter Archer.Assesing teaching presence in a computer conferencing context[J].Journal of Asynchronous Networks,2001(2).
4[4]Liam Rourke,Terry Anderson,D.Randy Garrison,Walter Archer.Assessing Social Presence In Asynchronous Text-based Computer Conferencing[J].Joumal of Distance Education,2001 (2).
5[5]Garrison,D.R.,& Cleveland-Innes,M.(2005).Facilitating cognitive presence in online learning:Interaction is not enough.The American Journal of Distance Education,19(3),133-148.
7Sfard, A. On two metaphors for learning and the dangers of choosing just one[J]. Educational Researcher, 1998, 27(2): 4-14.
8Tess, P. A. The role of social media in higher education classes (real and virtual)-A literature review[J]. Compuers in Human Behavior, 2013, 29(5): A60-A68.
9Cho, H. C., Gay, G., Davidson, B. & Ingraffea, A. Social networks, communication styles, and learning performance in a CSCL communi- ty[J]. Computers & Education, 2007, 49(2): 309-329.
10Ismail, S. International students' acceptance on using social network- ing site to support learning activities[J]. International Journal for the Advancement of Science & Arts, 2010, (2): 81-90.