How Casey Neistat changed YouTube forever

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How did Casey become one of the biggest names in Youtube? Was it just hard work, or is there more to it than that?

Casey Neistat: https://www.youtube.com/user/caseyneistat/videos

Artwork in thumbnail : https://www.youtube.com/watch?v=isWbTeXYt9U

Google plus: https://plus.google.com/u/0/106264745922042638061
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