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Captcha Algorithm

I noticed that Stack Overflow only intercepts me sometimes. Does anyone know if he has a good algorithm for determining if I can be a robot or if it's just random.

Reducing addiction to captchas is definitely a good thing.

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Stackoverflow.com uses reCAPTCHA . And I also noticed that when you try to edit the same question many times in a few seconds, it displays the captcha checkout page.



Most of the CAPTCHA generation algorithms are quite powerful. This article describes the factors that affect the strength of a CAPTCHA.

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My impression is that SO is tracking user activity and is a captcha in case of a suspicious beaviour, for example, in the case of frecuent messages or comments.



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It appears when you post (or edit) the same post or post in the same question many times. It seemed to me when I edit twice in less than a minute

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I never came across Captcha on SO because I used a google account and gave no reason to suspect that I am a bot I think. If you don't create local logins, you can save money on Captcha and saving passwords.

EDIT Now I've seen a few catches on the site, really don't know what is running them.

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