Speaking to a crowd at this year's South by Southwest festival, YouTube co-founder Steve Chen said the original intent of YouTube was to be a video dating website. It's difficult to imagine now, but the original vision of YouTube was to digitize the old school VHS video dating services, in which people would record a profile about themselves in hopes of finding a match. Here's what Chen revealed, according to CNET:

We always thought there was something with video there, but what would be the actual practical application? We thought dating would be the obvious choice.

Sources: The Guardian | CNET