21 April in internet history
Things that can be dated to 21 April: the day something was posted, a record that changed hands, an event research has pinned to a date. Every entry links to where it was read.
Nothing this archive holds can be dated to 21 April. That is a statement about what has been researched so far, not about the day.
Also around this weekWithin three days
These did not happen on 21 April. They are shown because the day itself is thin, and each one carries its own date.
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The End of the World Albino Blacksheep uploads a copy to YouTube, which is watched about fourteen million times. Wikipedia — The End of the World (video)
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The Reddit blackout Reddit announces it will charge for access to its data, which had been free. Wikipedia — 2023 Reddit API controversy
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It's Over 9000! The dubbed episode is broadcast. Wikipedia — It’s Over 9000!
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Xiao Xiao The first animation in the series is released. Wikipedia — Xiao Xiao
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Kony 2012 Cover the Night, the campaign’s day of action, takes place. More than fifty thousand had signed up; one gathering in Vancouver has seventeen people. Wikipedia — Kony 2012
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Me at the zoo Jawed Karim uploads the video at 8:31 in the evening, Pacific time. It is the first upload to the site. Wikipedia — Me at the zoo
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Chocolate Rain Tay Zonday uploads the song to his YouTube channel. Wikipedia — Chocolate Rain
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The monkey selfie An appeal court rules that animals cannot hold copyright or sue under the Copyright Act. Wikipedia — Monkey selfie copyright dispute
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Me at the zoo Me at the zoo was posted to YouTube. The upload on YouTube