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Hard Twitter

Which NASA astronaut posted the first unassisted off-Earth Twitter message?

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Hard Twitter

Which chat protocol inspired Chris Messina's hashtag idea for Twitter?

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Intermediate Twitter

Which mobile crash-reporting tool did Twitter acquire in January 2013?

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Intermediate Twitter

Which baseball manager sued Twitter over an impersonation account in 2009?

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Intermediate Twitter

Who introduced the use of hashtags on Twitter in 2007?

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