How YouTube Changed Journalism

YouTube is now the third most viewed website in the world, boasting over one million viewers who watch more than six billion hours of footage each month. For popular music fans, YouTube is this generation's MTV. YouTube—which Google purchased for $1.65 billion in 2006—is a phenomenally successful entertainment medium: the site is now valued at $40 billion. Seven years after Jawed Karim's failure to find video footage of the Indian Ocean disaster, the 20 most popular YouTube videos