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I answered to my two of my own questions on http://meta.drupal.stackexchange.com, and in both the cases the CAPTCHA appeared. I was not editing the same answer twice in row; I was answering two different questions with a CW answer, and passed 4 minutes between an answer and the other, as I was looking for any questions without an answer, to avoid Community would bump the questions. I am a moderator on Drupal Answers, and the questions to which I added an answer are both listed in The 7 Essential Meta Questions of Every Beta.

After 19 minutes (see my activity on meta.drupal.SE), I then added a second answer to the question asked by another user (on the same meta site), and also in that case the CAPTCHA appeared.
I also edited one of the previous answers I gave (just few minutes ago), and the CAPTCHA was not shown.

Is this normal?

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I think I always see the captcha when I answer my own question, even on metas. – Gilles May 8 '11 at 22:27
    
It happened I added an answer to my own questions, before, but I have never seen the CAPTCHA. – kiamlaluno May 8 '11 at 22:29
    
Answering your own questions sounds like suspicious behavior to me. – Tobias Cohen May 9 '11 at 0:27
    
@Tobias Cohen It's the site where I am a moderator; We were asked to take care of those questions in the meta site without any answer, and considering that the questions were those that are listed in The 7 Essential Meta Questions of Every Beta, I added an answer to those questions. – kiamlaluno May 9 '11 at 0:34
up vote 4 down vote accepted

Is this normal?

Nope, it's not :)

This was a typo that caused one of the spam prevention mechanisms to fail for self-answers, and a failing spam prevention mechanism means you get a captcha.

This is fixed in the next build.

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Has it shown up every time you posted something?

Usually the CAPTCHA shows up if your post rate is higher than a certain threshold. I don't know the exact threshold, but even I've gotten it a couple of times when I answer questions quickly so I'm assuming it's in the range of a couple of minutes.

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I don't frequently ask question on that meta site, or even answer to questions (for the simple fact there are few users asking questions). I think those were the first two answers I provided on that site. – kiamlaluno May 6 '11 at 4:14
    
I checked, and I have answered to the second question 4 minutes later than when I answered to the first question. – kiamlaluno May 6 '11 at 4:18
    
@kiamlaluno hmm, we'll have to wait till someone with more knowledge on the limit looks at this. But it's not unexpected, all users run into captcha – JohnP May 6 '11 at 4:22
    
It is only unexpected that I would see the CAPTCHA in those cases. – kiamlaluno May 6 '11 at 4:24

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