Keep a good page up forever.
If you have any good information to share, put it up on a page on your site. However, it will be so much more useful if it always stays in the same place with the same name. That way, when it does eventually get indexed into a search engine, it will stay where the search engine will find it.
If you ever move it, it may not get indexed by the search engines any time soon again. Now someone looking for that information will get a "file not found" if they follow the search engine hit, and they won't find your page in its new location.
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