This plugin will generate a special XML sitemap which will help search engines to better index your blog.
it's good but not perfect.
WP generates their own sitemaps automatically, which you can access at yourblogname.wordpress.com/sitemap.xml
No need to do anything extra on your end. The sitemap file included with your blog is available to every search engine that supports the protocol, including Google, Yahoo!, Bing, Ask.com, and others. WordPress.com automatically sends updates to search engines every time you update or delete a page or post.
For more info visit this
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