Testimonials are a great way to build trust and amplify desire on your website. They work on the principle of social proof. People will think: "If someone else has bought in the past and had a positive experience, there's less chance that I'll regret my purchase down the road."
Testimonials also add a sense of pressure when people talk about how important something is or how they can't believe that others can live without it.
You can also use Facebook comments to improve the authenticity. Also, a live Twitter feed with people mentioning you is good.
Correct Example: