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Susan,
The reviews on these sites (other than the ones that say "amazon review" at Amazon) are generally under copyright and can't be reposted (at least, not legally) without permission and usually compensation. The synopsis (or at amazon, "product description") is generally fair use to post, as it is basically a press release from the publisher or author.
I know some sites will take down listings if you repost reviews (Amazon will also cancel an affiliate account for doing so; I suspect some places, like Publishers Weekly, might try to collect for posting their reviews).
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