Back in 2007, I wrote about a Yahoo patent describing how Yahoo! might crawl a webpage, and then recrawl the same page around a minute later to see if any of the links on the page had changed. It might do that to try to identify what it called “Transient Links,” or links that [...]
Source: http://www.seobythesea.com/2011/12/how-google-might-identify-transient-content-on-webpages/
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