user registeration form without captcha?

Posted by terrani on Stack Overflow See other posts from Stack Overflow or by terrani
Published on 2010-05-09T11:39:56Z Indexed on 2010/05/09 11:48 UTC
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sign-up

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captcha

Hi,

I was trying to sign-up Twitter today and I noticed that their registration form does not have a captcha. The form URL is https://twitter.com/signup. I also noticed that they used an input like below.

<input name="authenticity_token" type="hidden" value="ce803cee65a96aaa97bdf75da166599c3adc9ec8" />

what kind of method is this?

Do they create a temp value in their database when a user access the registration form? and check it when a user submit the form?

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