It depends on what this thread is really. Is it a book review thread? Then spoilers should be hidden as review shouldn't ruin the book for other people. If it is a thread for the discussion of plot points and general on going storylines then spoilers should be expected.
The title says review thread. That means to me, cover up spoilers, people come here to read reviews of the book, not a storyline breakdown, just like film critics don't tend to give away spoilers in movies.
Maybe there should be a thread for 'The Fall' storyline discussion.