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On Oct 16, 2009, at 1:51 PM, Cosmin Apreutesei wrote:

no need - what could a spammer do with a captcha + delayed indexing? this
spam thing is a lame excuse IMHO

Captcha are not very user friendly as they tend to get in the way.

Alternatively:

"Stopping spambots with hashes and honeypots"
http://nedbatchelder.com/text/stopbots.html

A relevant joke:

Jim and Joe are out hiking in the forest, when in the distance, they see a huge bear. The bear notices them, and begins angrily running toward them. Jim calmly checks the knots of his shoes and stretches his legs. Joe asks incredulously, "What are you doing? Do you think you can outrun that bear!?" Jim replies, "I don't have to outrun the bear, I just have to outrun you."