msm-sitemap
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Sitemap Pings
WP.com sitemaps have a ping feature that automatically notifies Google and others when a sitemap changes. We should implement that here.
Some implementation thoughts:
It looks like the three sitemap API services that WPCOM supports (Google, Yahoo!, and Bing) all only require the index to be resubmitted.
Google and Bing are also publicly available while Yahoo! requires an API key to be defined.
Oh, neat, it looks like Yahoo and Bing now share site-submission so we can use the more open protocol for both.