How do you get people so excited about a product that they'll tell their friends and spread the word? It starts with an interesting story that people will want to talk to each other about and pass along to their friends. The story is the key, according to Bryan Lukas, associate professor of marketing in the Department of Management and Marketing at the University of Melbourne.
The professor cited Krispy Kreme as an example of where a good story creates WOM. Instead of buying expensive ads, new stores are launched by giving away free donuts. Excited customers tell their friends about the free giveaways, who tell their friends, and so on...but of course WOM had nothing to do with KK's implosion!
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Source: http://www.womma.org/pages/2006/06/successful_wom.htm