Keith Rabois, formerly of PayPal and now at Square, sent us an email about a website called YouTube.com. Three of our former PayPal colleagues had launched a new service, and Keith thought we would find it interesting. At first glance, the value proposition was obvious. We uploaded videos, in my case of our honeymoon that had been sitting on a hard drive for two years without seeing the light of day. YouTube made sharing them with family and friends completely effortless. Then we surfed around the site and watched videos others had posted, and before we knew it, an hour had passed. It was immediately apparent that YouTube had tremendous potential as a platform for user-generated videos.