LibraryThing.com
LibraryThing is an online resource that allows users to create their own book libraries. Users can search for books on the site and add them to their profile, organizing them by creating and naming book collections, as well labeling the books with curated tags. When a user adds books to their library, LibraryThing generates lists of recommended books they think the user would enjoy based on the genres, authors, and languages of books the user frequently views or adds to their library. Users can also search for books on LibraryThing using tags. The tags don't need to be specific. In fact, when a user searches for books using tags, they will be given search results of books labeled with tags curated by other users. This allows for users to connect and share with others their personal interpretations of said books.
LibraryThing also has a "Local" tab where users can input their location (user locations are not shared with other users unless one grants permission to have their location displayed on their profile) and discover "Little Libraries" found near them. This can be an invaluable resource to teachers, as both teachers and students alike can create their own libraries of books they've read or would like to read. Teachers can even create a class library via LibraryThing, where the books used in the course are displayed and are built upon throughout the school year. LibraryThing also has a widget--Teachers can use the widget on a class site for quick access for students.
It is also worthy to mention that LibraryThing isn't a direct source to read books--it instead offers links to sites and/stores that have the book available to read. Users instead can connect with one another through the LibraryThing community to discuss shared interests in books, book genres, and reading, as well as discover new authors and millions of new titles.