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You can recommend a book to another user and other users can make book recommendations to you. Book recommendations can be done in two ways:
First, locate the item you want to recommend using a search or clicking through to it on your bookshelf, then click the “Recommend this item” icon next to it:
Next you have to choose the user you want to recommend this to; use the search box that displays on the page, and once you've found the right user, click the “Select user” icon:
You then have the option to enter personal text to appear with the recommendation:
Once you've sent the recommendation, the user will see a notification for it when they log in: