9 Definitions of Viral Marketing & 1 Real Life Example

Definitions of Viral marketing on the Web:

define:Viral marketing - Google Search:

any advertising that propagates itself. When Hotmail users send e-mail, they unwittingly infect the recipient with the tagline at the bottom of the message.
www.expedite-email-marketing.com/internet_marketing_glossary_internetmarketingtermsdefinition.htm

Any marketing technique that induces Web sites or users to pass on a marketing message to other sites or users, creating a potentially exponential growth in the message's visibility and effect.
www.c-latitude.com/glossary.asp

marketing phenomenon that facilitates and encourages people to pass along a marketing message.
www.tobysimkin.com/reference/Ref_Net_Glossary_Terms.asp

A campaign that uses word-of-mouth or “tell a friend” mechanisms.
multichannelmerchant.com/webchannel/affiliate/online_glossary/

Encouraging visitors to an online site to pass along a marketing message by providing an incentive for doing so.
www.positioning-search-engines.com/glossary.htm

is a technique whereby users are encouraged to pass on messages, especially slogans or product recommendations, to friends and relatives.
www.tecc.com.au/tecc/guide/glossary.asp

Online advertising, typcially through e-mail, which encourages recipients to spread the message (ie sign up 5 friends for a free gift)
www.metromemetics.com/thelexicon/v.asp

the marketer uses electronic media to stimulate and encourage word-of-mouth or electronic message dissemination between individuals.
wps.pearsoned.co.uk/wps/media/objects/1452/1487687/glossary/glossary.html

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.
en.wikipedia.org/wiki/Viral_marketing

And here is one Good Example of Viral Marketing that you can participate in.

Paul