"Unleashing the Ideavirus" is a marketing manifesto advocating for ideavirus marketing, a strategy that focuses on creating "big ideas" that spread organically through targeted groups ("hives") via word-of-mouth amplified by digital tools. The author argues that traditional interruption marketing is ineffective and expensive, while ideavirus marketing leverages "sneezers" (influential individuals) to spread ideas, creating a win-win scenario for consumers and businesses. The book provides examples of successful ideavirus campaigns and offers a framework for identifying, launching, and profiting from them, emphasizing the importance of smoothness, persistence, velocity, and choosing the right hive. Success depends on dominating a niche market before expanding and understanding the lifecycle of the ideavirus.