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YouTube’s challenge: Name the people and the moments of 2013’s best videos

WASHINGTON — YouTube is celebrating the end of 2013 with a mashup of the site’s most popular moments of the year.

They asked people from the most popular YouTube videos of the year to star in the mashup. Throughout the video, references are made to the year’s top videos and memes.

Can you name the YouTube stars? What about the references?

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