I had asked a question earlier, and when I clicked the button to publish the question on the site, I had been hit with a captcha "in order to make sure I'm not a robot."

A couple thoughts about why I think this may have popped up:

  • I'm in a different location: I live in Toronto, which is also the location that I list in my profile. However, I am currently in the moment in Kristiansund, Norway. This is strange, because I have also made posts to this site during my visit in Norway (albeit in different towns such as Drammen, Norway), and I have not encountered the captchas at that time.
  • Note, I had 2, 406 reputation points at the time of the question writing.
  • I was also signed in, and active particularly on chat before writing the question.
  • The question was not copy pasted into the box, which Free Radical suggested could've been a reason.

Here is a screenshot showing the captcha:

Human Verification Dialog


The more the system trusts you, the fewer captchas you get. Anonymous visitors get one as soon as they search for something. As soon as you have an account with a few reputation points, captchas are reduced, but they don't disappear. The rules for captchas aren't publicized, but there are two common situations where even high-reputation users will be hit:

  • If you start typing an answer, leave it alone for a long time, and finally complete it and post, you'll get a captcha. (I think what happens is that your browser requests a token when you start typing, and when you post, the server checks the age of this token. If the token has expired by the time you post, your browser gets a new one and posts immediately, so you get a captcha because the server thinks you wrote the answer in an instant.) I don't remember hitting that with questions, but that may just be because I ask fewer questions than I answer.
  • If you do many things too quickly, you may get a catpcha. I've had captchas as a moderator when I made some quick repetitive actions.
  • Alright. Thanks! That makes sense :)
    – Zizouz212
    Jul 31 '15 at 10:46

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