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Why do i get captcha when posting a question?

Besides that - captchas cost like $1 for 1000 and don't protect from bots. They just annoy legal users.

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    $\begingroup$ I'm not sure why you did get a captcha ... I didn't see any for a long time. I think there is some heuristics ... when your question looks a bit like spam, for example. I suppose Stack Exchange will not publish the exact details of this. $\endgroup$ Feb 28, 2013 at 19:07
  • $\begingroup$ And how long will it treat my posts as spam? Must i accept it and continue entering captchas before every question? $\endgroup$ Feb 28, 2013 at 20:52
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    $\begingroup$ Rumours say that the more voted answers you write, the less captchas you get. $\endgroup$ Mar 6, 2013 at 6:24

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