How do I make sure the Rich Snippets are working properly?
To make sure search engines are grabbing the rich snippets content correctly, you can use the Google Structured Data Testing tool available at: http://www.google.com/webmasters/tools/richsnippets
You can read more about how to use Rich Snippets in the Testimonials Showcase plugin on this page: http://cmoreira.net/testimonials-showcase/rich-snippets/