Google Explains CAPTCHA

Spam is as big a problem as always, recent studies found that as much as 95 percent of all email is spam. But it’s not just email, spammers are always finding new avenues. As any bloggers who hosts their own blogs will tell you, spam in the comments is a huge problem. One way of deterring it is by using a CAPTCHA (completely automated public Turing test to tell computers… (read more)