Given the passion and high profiles of "Twitterverse" denizens, the service has evolved into a vital early-warning system for businesses seeking to stave off criticism, and as a way to build better relationships with customers. That is why companies need to know Twitter. Embracing it can help a business thrive; ignoring the service could well hurt it.
For companies unfamiliar with Twitter, this book serves as a field guide. They will get a Twitterverse tour, and learn about the dozens of firms big and small that have harnessed Twitter as a powerful, flexible business tool. The bottom line: Twitter means business.