Many non-fiction authors are considered experts in the subject matter that their work is based on. As a subject matter expert, there are dozens of online communities that would love for you to join their conversation on matter similar to your book subject. This allows you the opportunity to also promote your book.
If you create multiple Google Alerts at http://www.google.com/alerts, Google will email you whenever a new conversation, or a new news story or blog post on a given subject, appears. Remember that you want to participate in the conversation, not spam it will book ads.
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