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PayPal alums Chad Hurley, Steve Chen, and Jawed Karim begin work on a "Flickr or HotorNot for video." They register youtube.com the next day.
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"Me at the Zoo" -- 19 seconds of Karim in front of the elephants at the San Diego Zoo -- is the first video posted to the site.
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Google buys YouTube for $1.65 billion.
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YouTube and CNN host their first presidential debate, featuring citizen-submitted video questions. In the 2008 election cycle, 7 of the 16 presidential candidates announced their campaigns via YouTube.
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YouTube is rolling out its first approach for selling ads within videos, nearly 10 months after Google agreed to buy the site.
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YouTube passes 1 billion videos a day but remains unprofitable. Analysts estimated 2009 revenue of $240 million, but YouTube spent more than $700 million storing and serving all that video.