YouTube, the online video powerhouse, turns 20
The video hosting site has gone from hosting a 19-second clip titled "Me at the Zoo" to becoming the world's largest in terms of time spent and ad revenue.
Tomas Kauer - News Moderator 
The video hosting site has gone from hosting a 19-second clip titled "Me at the Zoo" to becoming the world's largest in terms of time spent and ad revenue.
