Contagiousness: The Science, Design and Engineering of Contagious Ideas. Social media master Dan Zarrella has amassed years of experience helping people negotiate the often mystical place of social media marketing. Now, he has condensed those well-tried ideas into this concise and conversational book. Zarrella’s Hierarchy of Contagiousness demystifies and deconstructs how social media works, who it benefits and why we all depend upon it to help our good ideas spread.

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