Is there any sort of expert matching on Stack Overflow? Does SO take any implicit measures of expertise to influence how it distributes questions? Do newbie questions go to the same users as questions that would require a lot of expertise to answer?

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This would be an interesting feature. Just about impossible to implement in a satisfactory way, though. –  Pops Oct 14 '10 at 20:55
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3 Answers

No, all questions go to all people who want to see them.

In other words, questions aren't sent to anyone. Users can view and answer any question that is posted. Most "expert" users will generally focus their attention on questions with a particular set of tags, so be sure to tag your question appropriately for what topic(s) it covers.

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But in how they distribute questions, do they take into account expertise? –  user152360 Oct 14 '10 at 20:51
@user There is no "distribution" of questions. –  Grace Note Oct 14 '10 at 20:53
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People just find the questions they want to answer. The questions on the active tab are just those with recent edits or answers. The only way people are given questions they are best-equipped to answer is ability to set interesting and ignored tags.

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No (hmm, maybe reputation). No. No.

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I know, but my question accounts in the distribution of unanswered questions. You don't see every question that is asked, but rather a subset. –  user152360 Oct 14 '10 at 20:52
@user, actually, you do see every question that is asked, unless you explicitly block some by using ignored tags as described in Simon's answer. (Or unless you're a slow reader. Two thousand questions a day isn't that many.) –  Pops Oct 14 '10 at 20:56
@user: "Unanswered questions" is not a distribution, it is a filter. If your question has no answers, or no upvoted answers, you will find it there. –  Ladybug Killer Oct 14 '10 at 20:58
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