Google Sitemaps 7 Benefits You Can`t Ignore - From your Google...
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>From your Google Sitemaps account you can also see when your sitemap was last updated and when Google downloaded it for processing. It will also tell you if there were any problems found with your sitemaps.
Google Sitemaps can be used with commercial or non-commercial websites, those with a single webpage, through to sites with millions of constantly updated pages. However a single Google Sitemaps file is limited to 50,000 web pages. For websites with more pages, another Google Sitemaps file must be created for each block of 50,000 pages.
If you want Google to crawl more of your pages and alert them when content on your site changes, you should be using Google Sitemaps. The other added benefit is it's free.
If you're expecting this special alert process with Google Sitemaps to improve your Page Rank, change the way Google ranks your web pages, or in any way guarantee inclusion of your web pages, Google has made it clear it will make no difference.
Google Sitemaps web pages are still subject to the same rules as non Google Sitemaps pages.
If your site has dynamic content or pages that aren't easily discovered by following links, Google Sitemaps will allow spiders to know what URLs are available and how often page content changes.
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