reCaptcha to capture you

I am so sure almost 99% of you all have used Captcha in some ways when you purchase things online or submitting comments over the net. Captcha is acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart". It's one of those moments when you see distorted letters and numerals on screen and the system would require you to retype them to make sure that you are a person who is going through the process. What interests me is the adaptation of this idea called reCaptcha.  Instead of 1 set of words are expected to be retyped, there are 2 sets of words to be confirmed by the user. During the process of this entering the words and letters, it's utilizing our time to digitize content from sources such old books, newspapers and radio programs being during the time while the bulk of these content are being scanned, many times, a portion of the content cannot be read or digitized properly and thus reCaptcha aims to use our time doing verification but at the same time to digitize content. The initiative is super intelligent that it aims to use our time smartly and for a bigger cause of the society. More importantly, this initiative needs your participation to make it work. The more you apply reCaptcha on your site, the more people would be exposed to participating in the process. Please keep this happy ball rolling for yourself and others.