in Goodreads (the social network for books), there's a system where you can add books to the website's main database as a Goodreads Librarian--a status gained after you add 100 books (forgive me if I'm wrong with the number) to your own shelf. As Goodreads Librarian, you can also edit the information, combine different version books, and in some cases--delete books.

Maybe Mubi can develop something like this?
Just my two cents, though.