Like i said in my previous post, i don't think a review campaign is an advertisement in itself, maybe for the period the review campaign lasts, it will expose your product to potential customers, but if you end the campaign there and leave it at that, it would not be long before people forget about your company and what they offer. Like you said, when people want to find out more about a service, they can go to the reviews held on it, but first of all it is advertisement that makes people find out about that particular service, before they go in search of more information, and it is signature campaigns that does that advertisement.