YouTube is a video-sharing website on which users can upload, share, and view videos.
Here are the Top 5 Most Popular Youtube Videos Of All Time
Justin Bieber's music video for "Baby" is the most-watched video ever on YouTube.
The 16-year-old pop star's video passed Lady Gaga's "Bad Romance" video to take the all-time lead. More than 246 million have watched Bieber's video on the Google Inc.-owned website- Billboard 2010
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