Tagging is putting books in categories. Three services,
Goodreads,
LibraryThing, and
Shelfari, let users create categories for books. They can rate books, share recommended books with others, and put books in categories.
This sound what librarians do, right? Users on the web are doing the same thing that catalogers do only they are going about it in much less formal way.
Answerboards are also becoming increasingly common.
Booklamp uses a mathematical algorithm to pair people with books.
What Should I read next is another online advisory tool that is freely available on the web.
Goodreads, LibraryThing, Shelfari, Booklamp, What Should I Read Next can be helpful reader's advisory tools. Since categories are informally chosen, expect some overlap and some disagreement.
