The screenshot is nice, but do you have a live demo of some business's testimonials, even if they're fake? I'd like to see how it sort of works and what my customers would be seeing before I create an account.
To get your customers to share a testimonial on your Testimonial Board you would need to redirect them to yourcompany.testimonialboard.com/new, then they will be able to share a testimonial about there experience with your product. You would have full control and can delete any unfair reviews.