That's a pretty cool idea, but I don't like that it's an added step for the user when submitting a form.
I used to get a TON of spam on my website(s) until I threw in a hidden text field. When the form is submitted I assume the submission is spam if the hidden text field's value isn't blank. I don't get spam anymore and people don't have to mess around with a captcha (plus nobody's complained).
...although I'm sure it's only a matter of time until the spammers figure this technique out.
I used to get a TON of spam on my website(s) until I threw in a hidden text field. When the form is submitted I assume the submission is spam if the hidden text field's value isn't blank. I don't get spam anymore and people don't have to mess around with a captcha (plus nobody's complained).
...although I'm sure it's only a matter of time until the spammers figure this technique out.