I came to understand that certain search engines cache websites that they crawl. This is to improve the speed of search and also prolong the content on certain sites.
It makes me wonder if that is a good or a bad thing. For example if someone blogged on some sensitive issues, and accidentally made the entry public, it means that the search engine will cache the entry. Even if the blogger deletes the entry it is still accessible. A particular search engine will only remove the cache if the link returns a certain error 404.
Most third party blog sites still return a valid page as part of their user friendly feature. Instead of showing the requester an error, they serve a decent page and informs that the information requested is not available.
So that makes me wonder if search engines are good or bad for bloggers faced with this sort of issues.