Google reveals scope of Web-crawling task Multiple times each day, Google recomputes the relative ranking of the world's Web sites. And it must index several billion new Web pages added daily.

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But the scale of the Web means that comprehensive crawling consumes a lot of processing power, which typically means building huge data centers to power the software.

Would they know that they can download Web crawling software to help make the results more effective and they also have the ability to work with the general population to make search results better?

"Using "web crawler" software designed to search, index and back up a website, Mr. Snowden "scraped data out of our systems" while he went about his day job, according to a senior intelligence ...

According to a senior intelligence official, Snowden used ordinary "web crawler" software typically used to search, index and back up a website.