It has been a great 20 years for U.S. media innovators, with hundreds of billions of dollars created by companies that are helping democratize content production and distribution while developing new ways to connect advertisers and customers. Google and its disruptive advertising model leads the pack with a $370 billion market capitalization, but consider also companies like Facebook ($225 billion), LinkedIn ($25 billion), Twitter ($24 billion), TripAdvisor ($11 billion), and Yelp ($3 billion).