Jamal Edwards is a rangy black kid who last week got a personal video congratulating him on having registered 100 million views on his YouTube TV channel, SBTV, which he set up as a 15-year-old school boy rapper. The congratulations came from Chad Hurley, founder of YouTube. Edwards has what every media owner craves, the eyes and ears of a mass audience of young people both in Britain and in the U.S. He is courted by political leaders and entertainment stars. He has ambitions.