Google`s New Content Removal Tools - Removing Cached Copies
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Using the "noindex" meta content value is all you need to make sure you are not listed on the SERPs. If you just want to remove the "cached" copy on your site, you use the meta content "noarchive" and fill in the necessary options on the "remove URL" page. Once the Cached copy is removed, no description or cached copy is available for viewing. Again Google excludes the page from its cache for six months, and then proceeds to start crawling, indexing and caching as normal, so make sure that your robots exclusion protocols are in place.
Third Party Removal and Other Interesting Horror Stories
Now this is the most interesting bit. You can actually wipe out cached copies of another site owner's site if you want using these particular tools (if certain activities have been done of course). Let's assume your content has changed, as in the case of an SEO professional removing a negative article from his client's web site because it generates bad publicity. Now let's say your suddenly (gasp!) inquisitive and web savvy client checks out the cached copy and discovers that you have been sleeping on the job, and the SERPs still contain cached copies of the offending page.
However, instead of griping about your tardiness ("I changed it," you feebly explain) he goes to Webmaster Central himself, and from the remove URL page asks for the removal of that particular cached copy instead of just waiting for Google to refresh it whenever. While filling out the form to remove the cached copy, he adds that certain words have been removed from the page, and voila! The Googlebot checks the page, discovers it is true and wipes out the previous cached copy which exists.
Note that this means anyone (and I do mean anyone) can wipe out a cached copy of a page for SIX months if you have made any changes to it! This means no description on the SERPs for that page, and nothing for the searcher to check before he jumps head first into your page. This feature has been around for quite some time on Webmaster Central, but the tool makes the whole process faster for third parties to aid in the speedy removal of cached copies.
You can also remove pages which contain any sensitive information. For example, if somebody puts up my credit card information or a copy of my signature online, I can as a third party request that Google remove it from the SERPs. Also if another site violates my copyright I can request the removal of that page without asking for the site owner's permission (scrapers beware!).
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