The document discusses online marketing and building brands using digital tools. It explores how the web is being rebuilt around people and understanding the social graph, which maps how people are related and interact. It also examines what causes content to go viral, such as "information cascades" where people influence each other, and how exceeding a critical threshold of infected neighbors in a social network can lead a message to spread widely. Finally, it discusses the "social superpowers" people can have online to influence and shape conversations.
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