Captchas are those alphanumeric strings you have to key-in everytime you open an account, make a payment or take a poll online. Instead, Ankit Gupta (right) and Neeraj Agarwal came up with Yo!Captcha, an online advertising platform that offers readable brand advertisements and all the user has to do is fill in the blank based on the image to pass the captcha. “Advertisers know that target consumers are looking at their ads,” says Gupta.