Give me summary of the book "Contagious: How to Build Word of Mouth in the Digital Age" by Jonah Berger

Contagious: How to Build Word of Mouth in the Digital Age by Jonah Berger is a book that examines the concept of word-of-mouth and viral marketing in the digital age.

Berger examines how the digital world has changed the way people share and talk about products, services, and ideas.

The book provides strategies for successful word-of-mouth marketing, including creating a "sticky message", utilizing the power of social networks, and utilizing the psychology of the user.

Berger discusses the importance of creating an "epic story" that resonates with the audience and how to use the right timing and triggers to create an effective message.

Berger provides an in-depth look at the science of word-of-mouth, examining the psychology behind why people are more likely to share certain messages and how to create an effective message.

Contagious also provides case studies to show how companies have used word-of-mouth marketing to create successful campaigns.

Berger emphasizes the importance of creating an emotional connection with the audience and how to use word-of-mouth to create loyalty and trust.

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