Are CAPTCHAs a good idea?

Daniel Lemire, Weblog, Jan 03, 2013
Commentary by Stephen Downes

I hate capchas, partially because they prove machines are better than I am at unscrambling text, and partially because they don't work. Daniel Lemire meanwhile points to the recent trend that will spell the end of capchas: "spammers appear to be recruiting human beings. There is a large pool of people on Earth who will gladly get paid just to post spammy comments on minor blogs." (Cartoon) In the comments: this alternative.

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