American pop singer Ariana Grande joined YouTube at 13 years old.
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Casey Neistat uploaded his first-ever YouTube video.
The first video was uploaded to YouTube.
The 7-year old Ryan of 'Ryan Toysreview' was announced as the year's highest-paid YouTube star earning $22 million.
The vice president of Google, Susan Wojcicki, became the CEO of YouTube.
Psy's music video for 'Gangnam Style' surpassed one billion views on YouTube, becoming the first video to do so in the website's history.
