The video below refers (eventually) to viral marketing but the it also emphasises the importance of developing a network of advocates. This is one of the things I address when lecturing about and training professionals in networking and marketing skills.
[youtube=http://www.youtube.com/watch?v=kwpVnUXfC7o]
I searched for more and found this – “The Six Simple Principles of Viral Marketing
by Dr. Ralph F. Wilson, E-Commerce Consultant” http://www.wilsonweb.com/wmt5/viral-principles.htm
This bit made me smile – “I grant permission for every reader to reproduce on your website the article you are now reading”…