Does Google still crawl a page when this is used?
<meta name="robots" content="noodp"/>
And when should this be used?
Our robots.txt is set to index all.
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Google will still crawl the page, but if there is information about your page on dmoz, Google wont display that information on it's search result page.
One source Google uses to generate snippets is the Open Directory Project. You can direct us not to use this as a source by adding a meta tag to your pages.
To prevent all search engines (that support the meta tag) from using this information for the page's description, use the following:
<meta name="robots" content="NOODP">
To specifically prevent Google from using this information for a page's description, use the following:
<meta name="googlebot" content="NOODP">
If you use the robots meta tag for other directives, you can combine those. For instance:
<meta name="googlebot" content="NOODP, nofollow">