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What can librarians do?
Goodreads members with Librarian Status can edit book and author data, add covers, and combine different editions. Each book and author has one unique entry in the Goodreads database. Librarians help correct issues, like if the data isn't correct, or is missing things like the book description or URL.
Why not make everyone a librarian?
Initially, Goodreads allowed everyone to be a librarian. Anyone could edit data, add cover images, or combine books. However, they found that while 99% of the people did a good job, occasionally they had someone who messed things up. So they created a new status that they bestow on those interested in helping keep things nice and tidy, which has worked out well.