Remove a blog from Blog Search
Only blogs with site feeds will be included in Blog Search. If you'd like to prevent your feed from being crawled, make use of a robots.txt file or meta tags (NOINDEX or NOFOLLOW), . Please note that if you have a feed that was previously included, the old posts will remain in the index even though new ones will not be added.

Remove a RSS or Atom feed
When users add your feed to their Google homepage or Google Reader, Google's Feedfetcher attempts to obtain the content of the feed in order to display it. Since Feedfetcher requests come from explicit action by human users, Feedfetcher has been designed to ignore robots.txt guidelines. It's not possible for Google to restrict access to a publicly available feed. If your feed is provided by a blog hosting service, you should work with them to restrict access to your feed.

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