Dave Crocker, “Email History,” http://www.livingInternet.com/e/ei.htm (accessed March 18, 2008).
Richard Gay, Alan Charlesworth, and Rita Esen, Online Marketing: A Customer-Led Approach (Oxford, England: Oxford University Press), 8–9.
Peter Merholz, “Play with Your Words,” peterme.com, May 17, 2002, http://www.peterme.com/archives/00000205.html (accessed May 27, 2008).
Rachel Rosmarin, “Open Facebook,” Forbes, September 11, 2006, http://www.forbes.com/2006/09/11/facebook-opens-up-cx_rr_0911facebook.html (accessed June 22, 2008).
David Sifry, “State of the Blogosphere, April 2006, Part 1: On Blogosphere Growth,” Sifry’s Alerts, April 17, 2006, http://www.sifry.com/alerts/archives/000432.html (accessed May 27, 2008).
William Stewart, “Living Internet,” http://www.livingInternet.com (accessed June 21, 2008).
Danny Sullivan, “Who Invented the Term ‘Search Engine Optimization’?” Search Engine Watch, June 14, 2004, http://forums.searchenginewatch.com/showthread.php?t=78 (accessed June 6, 2008).