I really like the idea, simple and straight to the point.

What I am not that sure about is your pricing structure. I am not sure if it works as this kind of a stand-alone service. Maybe you could get existing Facebook oriented marketing service to offer it as an up-sell? Maybe some form of personal touch about you/team, or at least a "real" address in the contact section could give it more credibility.

Also I am curious: How did you get these testimonial brands?