Non-invasive CAPTCHA
Here’s a nice noninvasive CAPTCHA (the site seems to be down right now, probably because of Digg).
Basically, add a text input to your form, then use CSS to make it hidden. Unsuspecting spam bots will see it and try to fill it in with some value. Your code can simply reject the form if it sees a value in the trick form field. Pretty smart!
The whole arms race between site admins and spam bot developers is really interesting. I love that the two sides are constantly one upping each other. In fact, it reminds me of Red Queen Theory (who ever said fairytales are a waste of time?).
Enjoyed this post? Click to get future articles delivered by email or get the RSS feed.
