I spoke with Warren Whitlock, the founder of BestSellerAuthors.com, and the author of Twitter Revolution: How Social Media and Mobile Marketing is Changing the Way We Do Business & Market Online (Xeno Press, 2008). He is also a social media strategist, who works with authors, professionals and businesses. We discussed the genesis of the book, the impact of Twitter, best practices for using the short messaging service and the art of engaging in conversation online.