SAN FRANCISCO (Reuters) - Around midnight on Christmas Eve of 2009, a handful of employees at Twitter received an unconventional holiday greeting from Dick Costolo, then the chief operating officer.

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Billionaire Elon Musk, who was just named Time Magazine's 'Person of the Year,' is a fervent user of Twitter and quick to respond to criticisms from politicians about his vast wealth. Specifically ...

Black Twitter is the beating heart of Twitter overall. If you have a favorite meme, joke, or even way to use Twitter, it most likely started on Black Twitter. There is no Twitter — at least not ...