Viral Marketing:

• The rapid adoption of a product or passing on of an offer to friends and family through word-of-mouth (or word-of-email) networks.  Any advertising that propagates itself the way viruses do.

Viral is growing, no pun intended.  Traditionally this has been referred to as word-of-mouth, however with the advent of our dear interwebs here, viral can mean the spread through video, email, social networks, blogs, etc.

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Glossary Definition From ABC’s of Online Marketing by Alexandra Wharton, Issue 22, Revenue Magazine

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