1) The document discusses why online videos go viral, with Kevin Allocca from YouTube explaining key factors. 2) Videos are more likely to go viral if popular bloggers and social media users share them, which helps spread the content to a wide audience. User participation through remixes and parodies also contributes to videos going viral. 3) Unexpected or unusual videos also tend to spread widely online. The talk uses examples like "Nyan Cat" and videos by Rebecca Black and Bear Vasquez that went viral due to their unconventional nature.