The video for Psy’s Gangnam Style reached two billion views on YouTube.
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Ariana Grande released her 'Thank U Next' music video.
Casey Neistat uploaded his first-ever YouTube video.
American pop singer Ariana Grande joined YouTube at 13 years old.
A shooting took place at YouTube's headquarters in San Bruno, California.
The vice president of Google, Susan Wojcicki, became the CEO of YouTube.
