Viral Marketing
From Make Money Online
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What is Viral Marketing
Viral marketing and viral advertising refer to marketing techniques that seek to exploit pre-existing social networks to produce exponential increases in brand awareness, through viral processes similar to the spread of an epidemic. It is word-of-mouth delivered and enhanced online; it harnesses the network effect of the Internet and can be very useful in reaching a large number of people rapidly.
Definition from WikiPedia (http://en.wikipedia.org/wiki/Viral_marketing)
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