I don't see the need for nor do I have the desire to post a review in two threads. If I'm reviewing a Marriott brand property (for example), I'll post my review either in an existing thread in the Marriott forum or create a new property-specific thread w/ the review in the Marriott forum (and not in the new review thread). This seems to be me to be IB's attempt to be a TripAdvisor.
Cheers.