If all goes according to plan, Amazon, Apple and Google may soon have competition in the e-books market. Online document sharing site Scribd is taking a page from Netflix’s success story as it sets out to create the world’s largest subscription service for digital books. Scribd has begun offering an ebook subscription service that will boast thousands of titles published by HarperCollins before July of last year. Recent best sellers from HarperCollins aren’t included although customers will be able to buy new titles individually on the Scribd site. HarperCollins becomes the first of the five largest US publishers to join the service. It’ll cost 9 dollars US a month for unlimited access to most of HarperCollins’ back catalogue as well as an assortment of books from smaller publishers