http://en.wikipedia.org/wiki/Viral_marketing
http://www.wilsonweb.com/wmt5/viral-principles.htm
http://www.davidmeermanscott.com/documents/Viral_Marketing.pdf
http://www.google.com/search?q=viral+marketing&tbo=p&tbs=vid:1&source=vgc&aq=f
http://www.viperchill.com/
http://marketing.about.com/od/viralmarketing/Viral_Marketing.htm
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