Fred says that CAPTCHAs don't work in preventing comment spam on his blog. There are three possibilities: 1) Humans are directly adding the spam, 2) The TypePad CAPTCHA algorithm has been broken by some fancy character recognition engine 3) The internet Axis of Evil is using something like Amazon's Mechanical Turk, which is really another form of 1. My bet is on 1.
It depends how CAPTCHAs are implemented, and how sophisticated they are. They'll certainly slow down spam, but no system is perfect. And it definitely won't stop non-bot spammers.
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