Over 2 billion YouTube users are logged in and watching every month

YouTube has hit a new milestone, with over two billion viewers logged into the service and going square-eyed every month. That's a little over a quarter of the world's population.As CNET reports, YouTube CEO Susan Wojcicki announced the news in a presentation to advertisers on Thursday. The site has been hovering just under two billion active monthly users since February, and has just tipped over the line.
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