Yesterday, on Comment is free, Christina Martin discussed Amazon's book reviews, and argued that we shouldn't be overly concerned that authors can log in under a false username, and leave glowing five-star reviews of their own books.

The Cif community seemed broadly to agree with her, but what do you think? Do you read reader reviews before you buy a book? Are there some online book review sites you can trust more than others? Or, is browsing the bookshop or library shelves still the best way of finding a good read?