Nicole Ellison and danah boyd have published an article in JCMC that includes one history of social network sites. That article, "Social Network Sites: Definition, History, and Scholarship" can be found at http://jcmc.indiana.edu/vol13/issue1/boyd.ellison.html
For an updated list of current scholarship concerning social network sites, see the list of Research on Social Network Sites at http://www.danah.org/SNSResearch.html
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