I just rejected a comment with a string of links, book-related, so it wasn't spam, but it was in the Booked by 3 post and I hadn't asked for other book sites. It may sound petty of me, but I do like to keep thing fairly organized and comments on the meme posts should be on topic.
If you have book sites you want to rec, just email them to me. I'll check 'em out and if I like them, I'll do a post about them. That way, everyone has a better chance of seeing them.
Thanks for your understanding.