Orkut feed reader may also serve as a cache when the original post is deleted by the blogger. Here's what the Orkut Feeds Help says:
If you Once a feed has been crawled, the content cannot be deleted from orkut. For example, last week you wrote a blog post that was crawled by orkut's feed reader and appeared in your profile. If you delete the post today, it will still show up as part of your orkut feed.