It's almost hard to believe, but YouTube turned 9 years old yesterday. First launched a dating site called "Tune In Hook Up" modeled after "Hot or Not," the online video giant eventually caught on with an audience eager to share everything for their cat to a cell phone video of their favorite band. YouTube has also become the world's favorite free streaming music site, paving the way for Spotify, Rdio, Rhapsody, et al. Latest Stats & YouTube's First Video YouTube Viewership Stats: More than 1 billion unique users visit YouTube each month Over 6 billion hours of video are watched...

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