How does google know a search result is a search result?
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In the google webmaster forums, google specifically states that you should not include search results in the google index. What is the best way to make dynamic, great content show in search results without receiving a penalty?
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Ensure you have unique and contextually relevant content ( text, images, video, audio) exposed on the dynamic page. As I understand it the engines are looking for content which has a valuable user experience. In the case of Google and Bing they are using their respective toolbars (and analytics services) to measure user engagement signals.
In this case, quality and maintaining rank for pages is reliant on both the content and user acceptance of your content. Ask yourself a simply question, will this page satisfy any user who comes to it? I try and have a question and answer for each page on my site, if the page content does not answer the question then I think again about how I can best deal with solving that.