On November 23rd Psy, a South Korean pop star, claimed the title for the most-watched online video. His goofy, rodeo-dancing “Gangnam Style” clip was viewed more than 805m times, surpassing Justin Bieber’s “Baby”. Psy’s sudden success underscores a broader trend: video has become the dominant form of (fixed-access) online content. Three years ago audiovisual entertainment was less than 30% of peak-time internet traffic in North America. That share has since doubled, says Sandvine, a consultancy. Web-browsing’s share has shrunk by two-thirds. Netflix accounts for a third of American peak-time traffic. YouTube is the world’s biggest purveyor of online videos, not all of them filmed in Seoul.