To promote the release of her new book, Perseverance: True Voices of Cancer Survivors, author Carolyn Rubenstein and publisher Forge Books, a division of Macmillan, are giving away a Kindle wireless ebook reading device on Twitter each day from August 18 through August 21 to four lucky tweeters.This will be an interesting exercise in marketing books, using an ebook reader to promote the sale of an actual book and whether the strategy will cannibalize sales of physical copies of the book. Ms. Rubenbstein’s website page for the promotion has a link to Amazon which is offering both the hardcover and...