yo!CAPTCHA, is a revolutionary platform for online advertising, which leverages the user-engaging potential CAPTCHAs have. Instead of the regular warped-text based CAPTCHAs it presents the user with a crisp readable brand advertisement. Below the advertisement is a simple fill in the blank based on ad-image, which the user needs to fill in order to pass the CAPTCHA. This leaves the ad-message etched in the users mind.