
Originally Posted by
Stevie D
The whole purpose behind reCaptcha, the reason why it became popular, was because it was supposedly doing something constructive - at the same time as it was fighting spam, it was also helping to decode and transcribe various scanned (historical?) documents. The theory was that if the same scanned text was flashed up on hundreds of different people's computers as part of a captcha and most of the typed in the same word, that was pretty certain to be correct, so they had now got the correct word to put in place of the scanned text.
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