Stealing reviews isn't funny.
Smart Bitches, Trashy Books reports on blog and Amazon reviews being used by an ebay store. Click thru to get the full details, including links to discover the books in question.
Yes, it does include children's and teen books. I've seen at least one review by a book blogger I know. You really should head over and make sure your work hasn't been stolen.
UPDATED TO ADD: Thanks to Jennifer A Ray for keeping us up to date with this; it looks like eBay is slowly removing the stolen reviews. She shares in her blogs what she has been doing to get the reviews (hers and others) off eBay; take note, in case you're an affected reviewer.