Google's snippets for sites like IMDb and Rotten Tomatoes include more information: movie directors and featured cast members. Google links to the corresponding page for each director and actor, so you can quickly find information about Alfred Hitchcock even if you only remember that he directed The Birds.
Google already shows rich snippets for reviews, events, recipes, people profiles, but web developers need to add structured HTML content using microformats, HTML5 microdata or RDFa. Even if IMDb doesn't use any of the three formats, Google still manages to extract useful information.
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