As you can read on Wikipedia,
Goodreads is an Amazon company and "social cataloging" website founded in December 2006 and launched in January 2007 by Otis Chandler, a software engineer and entrepreneur, and Elizabeth Chandler. The website allows individuals to freely search Goodreads' extensive user-populated database of books, annotations, and reviews. Users can sign up and register books to generate library catalogs and reading lists. [...] On the Goodreads website, users can add books to their personal bookshelves, rate and review books, see what their friends are reading, participate in discussion boards and groups on a variety of topics, and get suggestions for future reading choices based on their reviews of previously read books.
My question is:
Is there a scholarly alternative to Goodreads, that is, a website where you can shelf papers, journal articles, scholarly websites, and preprints as well as books?