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English definition of “viral marketing”

viral marketing

noun [U]     (also referral marketing, viral advertising) MARKETING, INTERNET
a marketing activity in which information about a product spreads between people, especially on the internet: Unless your customers are young, a viral marketing campaign targeting social networks may not earn a high return. In many ways hand-held technologies are the key to viral marketing.
(Definition of viral marketing noun from the Cambridge Business English Dictionary © Cambridge University Press)
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