This document discusses factors for creating successful viral videos. It identifies the top 3 YouTube categories as music, entertainment, and people & blogs. Key factors include using comedy, emotional, rational, or experimental approaches. Videos should be 15-90 seconds long. Other factors include having a catchy title/name, relevant keywords/tags, sharing on social media, seeding to influencers, and optimizing SEO, metadata and annotations. The document also discusses video analytics and measuring ROI from viral videos.