Shinseungback KimyonghunCAPTCHA Tweet, 2013, Web Application(www.captchatweet.com). 'CAPTCHA Tweet'* is an application that users can post tweets as CAPTCHA. Since computers can hardly read it, humans can communicate behind their sight. CAPTCHA has originally been developed to distinguish computers from humans. It asks the user to type text from a distorted image. This is easy for a human but difficult for a computer. It
