Google decided to add rich snippets to their search results helping users find more information on a large variety of subjects including people, food recipes, events and reviews. The goal being to help webmasters advertise their content better, and giving users as much information as possible before they made the decision to click through to a website. Over the last few years Google have added many more types of rich snippet to their armoury including products, video, music info, restaurants, business organisations, people and authors. As you can see below the snippets provide more eye-catching options than the review above.