Word-of-mouth marketing

Word-of-mouth marketing (WOMM), also called word of mouth advertising, is an unpaid form of promotion—oral or written^[1]—in which satisfied customers tell other people how much they like a business, product, service, or event. Word-of-mouth is one of the most credible forms of advertising because people who don't stand to gain personally by promoting something put their reputations on the line every time they make a recommendation.^[2]
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Marketing buzz

Marketing buzz or simply buzz — a term used in word-of-mouth marketing — is the interaction of consumers and users of a product or service which serves to amplify the original marketing message.^[1] a vague but positive association, excitement, or anticipation about a product or service. Positive "buzz" is often a goal of viral marketing, public relations, and of advertising on Web 2.0 media. The term refers both to the execution of the marketing technique, and the resulting goodwill that is created. Examples of products with strong marketing buzz upon introduction were Harry Potter, the Volkswagen New Beetle, Pokémon, Beanie Babies, and the Blair Witch Project.^[2]
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Viral marketing

Viral marketing, viral advertising, or marketing buzz are buzzwords referring to marketing techniques that use pre-existing social networks to produce increases in brand awarenessor to achieve other marketing objectives (such as product sales) through self-replicating viral processes, analogous to the spread of viruses or computer viruses (cf. memes andmemetics). It can be delivered by word of mouth or enhanced by the network effects of the Internet.^[1] Viral marketing may take the form of video clips, interactive Flash games,advergames, ebooks, brandable software, images, or text messages.