SBTI: The "unhinged" personality test

What started as a tongue-in-cheek tool to help a friend suddenly went viral. Enter the SBTI Test: a fast, funny, wildly shareable personality quiz that hands you a four-letter label and says, "this is basically you." It lives somewhere between "that's so true" and "is this a joke?" On the show: Niu Honglin, Steve & Yushun