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Twitter was founded in California, on this date by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams. Dorsey posted the first ever Tweet at 9:50PM. It read, "just setting up my twttr".
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The hashtag (#) debuts on Twitter for the first time.
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It is announced that Jack Dorsey is stepping down as CEO, and will be replaced by Evan Williams.
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NASA astronaut, T.J. Creamer posts the first off-Earth tweet from the International Space Station
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Evan Williams steps down as CEO, replaced by erstwhile COO, Dick Costolo.
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Twitter has reached 100 million users.
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A new Twitter homepage is tested in order to phase out the "old Twitter".
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Twitter celebrates its 6th birthday, while also announcing they've reached 140 million users and see 340 million tweets per day.
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The logo is changed to a slightly modified blue bird.
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Twitter has surpassed 200 million active users.
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Twitter launches a political transparency page, so that people can better engage with policy issues on Twitter.
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Twitter is averaging 330 million monthly active users.