Quora is “an information network that connects you to everything you want to know about.” Quora was founded by two former Facebook employees in 2009 and won a TechCrunch award for Best New Startup or Product of 2010. It says it “aims to be the easiest place to blend new content with the best of what’s on the web. We organize people and their interests so you can actually find, collect and share the information most valuable to you. When you want to know more about something, Quora delivers you answers and content from people who share your interests and people who have first-hand knowledge—like real doctors, economists, screenwriters, police officers, and military veterans. On Quora, it’s easy to create a personalized homepage of everything you want to know about by following topics, questions, people and boards.”
As with similar services, find a question that relates to your experience or expertise, and gently plug your book.