What do you do about your online archive which has stories which are now out of date? For example, a company went under and you wrote the story. Now it has been revived but the search engines keep delivering that old article.
The drastic measure is to take it out of your archive and tell the search engine people that they should take it out of their cache.
Don’t be Stalin
A better approach is not to erase history: after all, the company did go under. Instead write a new article on the new circumstances, and tag the old one with the new article. This way you don’t erase history, as Stalin did, but you get the whole scene over.