Does anyone know of a CMS that can replicate tripadvisor.com? Closest way I can think of is using a Joomla base with extra modules but if there are any other ideas I'd love the suggestions.
With a lot of work and frustration this can be achieved, and it certainly won't be a trivial exercise I'm sorry to say. There are no CMSs out of the box that would support all of this functionality. Extra modules bolted into an existing CMS will probably be the way to go.