How to implement Stack Overflow's "are you a human" feature?

Posted by Omu on Stack Overflow See other posts from Stack Overflow or by Omu
Published on 2010-03-04T15:52:59Z Indexed on 2010/03/15 19:09 UTC
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On this site if you do too many clicks or post comments too fast or something like that you get redirected to the "are you a human" screen. Does anybody know how to do something similar?

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