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CEO Jack Dorsey sets up first ever profile and tweet "just setting up my twttr"
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Twitter officially opens to the public
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Google designer Chris Messina proposes the use of the hashtag (#) on Twitter
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Jack Dorsey steps down as CEO of Twitter to become Chairman of the Board. Co-Founder Evan Williams takes over as the new CEO.
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Twitter reaches 1 billion tweets
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Twitter reaches 5 billion tweets
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Twitter announces that over 1 billion Tweets are sent out every week on its 5th birthday
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Announces the launching of the short-lived app Vine (RIP)
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Celebrates its 10th birthday