Since Google supported rich snippets, everyone is stagger about the right markup format. Rich snippets are additive informational elements intended to help users with specific queries. To call to mind, there are three different markups: microdata, microformats and RDFa. Meanwhile Google has officially recommended to use microdata format to generate rich snippets. They suggest microdata but the other markups are also acceptable.
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As you know, Google is adjusting his algorithm nearly every day to generate the most opportune results for search queries by default. Generously they gave us hints how we should act to prevent bad results for our websites.
Especially since “Panda” was rolling out, every webmaster was anxious to avoid any kind of issues with content. But in some cases you can´t really prevent duplicate or near duplicate content, even if multiple websites using the same content. At this point I want to mention about a few measures to help Google to avoid duplicate.
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It sometimes happens that websites returning the error code 404 which means the webserver can´t return the request. Mostly it´s a result of non-existing pages cause of broken links, deleted pages or misspelling entries. 
Hi, my name is Thomas Klein, Inbound Marketer from Germany. You are invited to contact me, to follow me on Twitter or to read even more about me.