The world's largest video site has romantic roots, says co-founder Steve Chen. Guess what day the YouTube domain name was registered? Long before Tinder made swiping a thing for matchmaking apps, there was a little-known video site trying to play cupid to the Internet generation: That's not exactly what comes to mind when you think of the world's largest video site, which welcomes a billion visitors a month. The idea was for single people to make videos introducing themselves and saying what they were looking for, said Chen. After five days no one had uploaded a single video, so he and the other co-founders, Chad Hurley and Jawed Karim, reconsidered.