ReCAPTCHA is a free service from Google in English that can block the spammers who try to spam our sites to fill in order to get traffic to their own. It is true that there is comment moderation and can be reviewed user accounts, but unfortunately the majority of spam is created manually by humans, but spammers use programs called "bots" that automatically fill web forms much more quickly than would any human being. These robots can become a nightmare and generate as much spam as you can gain control.
But all is not lost, ReCAPTCHA helps ensure that only people can use the services of their website. A CAPTCHA is an image with distorted characters that anyone can read, but the robots are difficult.
Anyone can use this service as it is free, particularly in ReCAPTCHA is that the data acquired service can help improve the process of digitization of texts and newspapers.
If you want to know a little more about this service, Luis Von Ahn ReCAPTCHA cofounder, explains in depth the performance in this video .
Seen: GoogleWebmasters
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