I need to post more abstracts! In the meantime, Gregor Aisch at vis4net has a fantastic map of the digital divide, or disparaties between Internet haves and have-nots (note: clicking in the image will take you to Gregor's full post):

If you want to read up on the digital divide, I recommend:
Chadwick, Andrew. Internet Politics: Sates, Citizens, and New Communications Technologies. Oxford: Oxford University Press, 2006.
Mossberber, Karen, Caroline Tolbert, and Mary Stansbury. Virtual Inequality: Beyond the Digital Divide. Washington, D.C.: Georgetown University Press, 2003.
Mossberger, Karen, Caroline J. Tolbert, and Ramona S. McNeal. Digital Citizenship: The Internet, Society, and Participation. Cambridge, MA: MIT Press, 2008.
Norris, Pippa. Digital Divide: Civic Engagement, Information Poverty, and the Internet Worldwide. Cambridge: Cambridge University Press, 2002.
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