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Last time I posted a question (about one year ago), I noticed that Stack Overflow had the "Are you human?" verification check with Captcha. Now, we seem to be able to just post questions and answers freely (as I noticed today).

How can you prevent against bots, then?

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    It isn't disabled. I got it a few days ago when posting a few answers in quick succession. – Oded Jun 27 '13 at 20:18
  • @Oded: But relaxed, maybe? – user102937 Jun 27 '13 at 20:18
  • Yes - it certainly isn't as... eager as it has been in the past. – Oded Jun 27 '13 at 20:21
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    I still see the verification whenever I am using a mobile device; switching IP addresses is a trigger. – Martijn Pieters Jun 27 '13 at 20:54
  • Yup, I got one just today... – Jon Skeet Jun 27 '13 at 21:12
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    @JonSkeet: It dared to question Jon Skeet... we live in a dark world. – Linuxios Jun 27 '13 at 21:48
  • A mod and Jon Skeet confirm being Captcha'd recently: perhaps someone should look into the possibility that the Captcha are in open revolt against important people? – Magoo111 Jun 27 '13 at 22:16
  • I get a Captcha when I type much too fast for a human being. Often I type like a human who's reasonably fast but pausing to think and it accepts that as evidence that I am human. I find if I slow down and make some mistakes towards the end of writing an answer, it'll forgive me for any near light-speed typing earlier on. – AndrewC Jun 27 '13 at 22:35
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    I never get CAPTCHA'ed. Does that mean I am human or just a smart bot? – psubsee2003 Jun 28 '13 at 0:05
  • @Magoo111: RIP StackOverflow, killed in the 2013 CAPTCHA uprising. – Linuxios Jun 28 '13 at 2:59
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The captcha appears when huge amounts of text are pasted in a post body at once.

There are other things that trigger the CAPTCHA, and I will add them as I find them out.

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    There are other things that trigger it. Bot-like things. Be very suspicious of anyone who complains about CAPTCHAs, lest they rend you asunder with their cold metal hands. – Shog9 Feb 24 '14 at 23:53
  • @Shog9 Brilliantly put :) – Neil Masters Feb 25 '14 at 0:01

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