Quote:
Originally Posted by incrediblehelp
Have been using them fro a while and they work great.
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Quote:
Originally Posted by edhan
I have been using them for my blogs. Quite useful though spammers are using trackback to spam.
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No matter how great they work, or useful they are, the fact remains that they are a royal PITA for users; and, many will not return to a site that employs them if at all possible. How many visits are lost is unmeasurable.
There are better CAPTCHA implementations available. These ask a multiple choice question, such as what day of the week is tomorrow, or what animal appears in the presented images, questions that are worded so as to be easily answered by a human, but not by a machine. The user need only click on the correct choice.