Top 10 Most Shared YouTube Videos of 2010

What happens when you put an awkward looking teen mouthing the words of Katy Perry's "Teenage Dream?" A viral hit with more than 24 million views of course. Watch the full video here

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Top 10 Most Shared YouTube Videos of 2010

One way to have a video go viral is to share it on Facebook and Twitter. These people did just that and drew at least 1.5 million views each.

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