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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You raise a good point here. Social media branding and viral marketing are now so closely related.
By the way, I laughed at the pun, whether it was intentional or not. 🙂