Online book community Goodreads has been acquired by Internet shopping behemoth Amazon.com (NASDAQ: AMZN) for a reported $200 million. The transaction will wed signature elements from each company: Goodreads’ vast book recommendations and reader base and Amazon’s Kindle e-reader. The acquisition should close in the second quarter of 2013. Exiting investors include True Ventures and an individual investor. Based in San Francisco, the startup will continue to operate as an independent entity, under the Goodreads brand.