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SEO in stackoverflow

It seems like Stack Overflow enjoys some privileges at Google. Whenever I ask a question and then do a search on Google (to check if I may have missed something or can the find the answer myself, now that I've asked the question...you know that, right? You can't find the freaking answer for days, but the moment you ask it on the Internet the answer suddenly flies to you!) my answer appears in the search.

How is Stack Exchange doing that? Do you guys have some special privilege or agreement with Google, so that they're checking your sites in real-time? Or is this just happening because Stack Overflow is so big and awesome?