[larnmar]

My solution:

“Thanks for posting your review on goodreads! As a final step, please enter the fourth word on page 93 of the book you’ve just reviewed”

[floren]

I read it on Kindle, oops.

Edit: "What's the second word of chapter 4" would work better but that's assuming harassers can't source an ebook and share it around... it'd prevent pre-release spam like this but so would disabling reviews until the book is actually released

[soapdog]

doesn't work because these trolls would just seed pirated copies of the book to their group. Even if you force people to use a credit card to register, they'd just buy prepaid cards for nothing, just to keep trolling. These people are cruel and in large numbers.

[johnnyo]

Page 93 of the Kindle version? The hardback? the paperback? or the large print version?

[anon73044]

Maybe something like "The last sentence in Chapter 8" "Fourth sentence in chapter 9" and so on.

[johnnyo]

I still think GoodReads would have issues there.

The first thing Goodreads asks you to do when you create a new account is to list and rate a bunch of books you've read and either liked or hated. This is important, because they (ostensibly) want to recommend other books to you.

When I first created an account, I quickly rated maybe 50 books on a 1-5 scale I had read over the years. I didn't have most of them handy.