Written by Tim O’Reilly, the founder and CEO of O’Reilly Media, and Sarah Milstein, co-author of “Google: The Missing Manual,” this book will demystify Twitter for anyone who’s still confused by retweets, twittering, and just about anything else associated with Twitter. Using lots of screenshots and an ample selection of examples, the authors delve into the obvious — well, obvious to anyone who’s already using Twitter — and the obscure. Of particular interest will be the chapter on “Twitter for Business: Special Considerations and Ideas,” which explores issues like managing multiple Twitter accounts, engaging journalists and PR professionals, and integrating with other channels of communication. The writing is lucid, the advice is sound, and the presentation is elegant. This book will help you make sense of Twitter.