SEO Tip #45: Do dates in URLs determine freshness?
Matt Cutts: I think dates in the URL or the content can be very useful but people can also try to optimize that and say they are always ten minutes old. So we have our own measures of how fresh pages are; for example the first time that our crawler saw a page.
We also look at revisiting pages how much the content changes. So I think it’s a good idea
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