A repost puts a book or artwork into the feeds of your followers.
If you read Clare's story and repost it, Henry will see the book in his feed if he follows you. It's a loop.
Reposted books and artwork also appear on your public profile, along with your own books. Reposts create a unique collection of work. They help you show the world what you like.
Reposts are like reblogging on Tumblr, retweeting on Twitter, liking on Facebook, and pinning on Pinterest.