Perhaps, sometimes you get really excited about something you’ve bought and tell your friends how good this thing is. Perhaps, sometimes you have a dinner at some restaurant and then tweet about it to let others know how tasty it was. In both these situations, you create a product of word-of-mouth marketing — the most natural type of marketing which implies simply sharing information with other people. Although it has some common features with viral marketing, WOM marketing uses other channels, and the information is shared exclusively by customers.

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