On 22 January 2013 04:28, Matthew Flaschen <mflaschen(a)wikimedia.org> wrote:
On 01/21/2013 03:00 AM, David Gerard wrote:
> Yes, but to count as successful it would have to
block approximately
> all, I'd think.
That's dubious. Blocking all spambots is not the
goal of any CAPTCHA.
The goal is to significantly decrease spam, and thus to save human
spam-fighters time.
Per the previous comments in this post, anything over 1% precision
should be regarded as failure, and our Fancy Captcha was at 25% a year
ago. So yeah, approximately all, and our captcha is well known to
actually suck.
- s.