Instead of solving enigmas that are scanned words, what your users with no-captcha need to do is select an answer to a simple question like "what's your favorite color".
Apparently google recognizes how you interact with the whole site and marks you as a real human accordingly.
Vid:
[ame]http://www.youtube.com/watch?v=jwslDn3ImM0[/ame]
Interesting stuff IMO
Apparently google recognizes how you interact with the whole site and marks you as a real human accordingly.
Vid:
[ame]http://www.youtube.com/watch?v=jwslDn3ImM0[/ame]
Interesting stuff IMO