6.
X is a rating site that allows users to rate the attractiveness of photos submitted by people voluntarily. Y, a Harvard University version of X, was concocted by Z while blogging about a girl and trying to think of something to do to get her off the mind. Y was considered illegal and was shutdown many times by the Harvard administration. Finally, K was founded as a spin off of Y, by Z himself. Initially housed under the domain of 'theK.com', the company finally dropped the 'the' and bought the domain for a whopping $200,000. Find X, Y, Z and K.