Hunger for Knowledge posted some concerns about this here:
Reblogging Reviews at Booklikes
When I read her title I thought this was dealing with attribution, but that's only part of the problem.
First I'm not picking on Whispers From the Pirate's Ghost here - because without the following reblogs I'd never have known this was a potential problem, and for that I'm grateful. The idea was interesting - here's one book and two very different reviews - one review rated the book at one star, and the other rated five. Those links are to the reblogs Whisper posted - note that both have reblog in the title, that part's working as intended.
Now here's the weird part. Check out the main book page:
Book page for The Artful
I don't want to post a screenshot - I'll just note that it's not completely clear that Whispers hasn't yet read/rated the book or reviewed it yet. You can't tell that those stars didn't originate with Whispers, and on my end it looks like Whispers has posted two reviews. And that's without having written a review yet, just reblogging.
I think all of us can pretty quickly see how this could be used to reblog multiple reviews and fill a book page. (I have no idea if there are any methods already in place to limit this, I haven't tried testing it.)
I've emailed Booklikes (if you want to here's their contact info), and there's already quite a few comments on Hunger for Knowledge's post discussing it. If any of you want to contact Booklikes or add your own comments it would probably be a good idea to indicate that you're concerned too. Hopefully this will end up on someone at Booklike's To Do List on Monday! (Or we'll hear back and learn it's already on that list.)