Last week admins for Facebook pages that were utilizing the Reviews application were warned that this functionality (along with discussions) would cease to exist from the 31st October, with Facebook taking the official line that:
“We’ve found the best way to encourage conversation and feedback is through posts and comments on your Wall, so we’re removing the Reviews and Discussions tabs for now. We’re working hard to help you moderate, filter and manage content in one powerful place. Stay tuned.
You won’t be able to access your reviews and discussions once they’re removed, so please save this content if you’d like to keep it for future reference.