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How do StackOverflow questions appear in Google search results so quickly?

How is it that questions posted to the Stack Overflow show up as #1 in Google search results just minutes after being submitted? What SEO practices are being used to generate this sort of up-to-the-minute accuracy?

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That's true, but Google won't crawl a site each 30 seconds. You can test it. You can post a question in SO, and it almost immediately would appear in your Google SERP. So, there should be a technique. Some kind of publisher/subscriber pattern. For example, SO may have this right to directly call a Google Bot, for newly created questions.
– Saeed Neamati
Commented Mar 1, 2012 at 8:59
6

Google will crawl a site every 30 seconds if it is popular enough and has lots of fresh content.
– John Conde ♦
Commented Mar 1, 2012 at 11:40

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