American pop singer Ariana Grande joined YouTube at 13 years old.
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Google announced that it had acquired YouTube for $1.65 billion.
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.
YouTube Live had the largest viewed broadcast ever, with guest artists performing from San Francisco and Tokyo.
A shooting took place at YouTube's headquarters in San Bruno, California.
