Book sites, such as Goodreads, can be an important source of exposure for authors.

Book review blogs

Getting reviewed on even a small book review blog can be a huge boost to book sales. For this reason, popular bok reviewers often have a waiting list measurable in years. Some reviewers have so many books from eager authors, that they refuse to take any more requests.

It is worth fostering a good relationship with the reviewing community but do not expect any special treatment. Just getting your book into the hands of popular reviewers can take a miracle.

Other book sites

Goodreads

Goodreads is the most famous of the book sites. It is owned by Amazon. Like most of the other sites here it allows users to track their collections of books and create virtual bookshelves.

Bookish

Bookish is a content discovery and e-commerce website devoted to books. The site enables users to browse an extensive database of books and authors, add books to user-created digital shelves, read editorial content, get custom book recommendations, and purchase physical books, ebooks, and audiobooks.

aNobii

aNobii is a social networking site aimed at readers. aNobii has readers in over 20 countries and is most popular in Italy.

Readgeek

Readgeek is an online book recommendations engine and social cataloguing service. Readgeek allows users to search for books matching their individual taste using advanced algorithms. Taking ratings and metadata of prior read books into account, those algorithms help Readgeek learn about your preferences. The service suggests books other users with similar tastes have enjoyed, rather than offering up books similar to the ones you have read.

LibraryThing

LibraryThing is another social cataloguing web site for storing and sharing book catalogues and various types of book metadata. Like Goodreads, it is used by authors, individuals, libraries, and publishers. It is not as polished as other sites but seems to enjoy an active user base.