Shelfari launched in 2006, a few years before the big e-book boom. Amazon was an early investor in the company and then bought it outright in 2008. The website allows users to build virtual bookshelves of the titles they own or have read, and can rate, review, tag, and discuss their books. Users can also create groups that other members may join, create discussions, and talk about books, or other topics. Does the Shelfari concept sound familiar? It basically was the precursor of GoodReads, which Amazon also owns. Today, Shelfari announced that their website was closing and all of their data was being merged with GoodReads.
Source: Amazon is Shutting Down Shelfari