Should Authors Repurpose their Book Content into an App?

Authors, How About an App for Your Book?Books inside an iPhone

Books are turned into movies all the time. But what about other money making avenues for repurposing content and expanding the reach of the book? How about creating an iPhone or Android app for your book?
The bestselling book What to Expect When You Are Expecting has an app that is a great example of how a book can expand its reach by creating a useful companion app.

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