Last August, a magnitude-5.9 earthquake shook Washington, toppling chimneys, cracking masonry and even damaging the National Cathedral and Washington Monument. In less than a minute, that same earthquake could be felt up the East Coast and in New York. But for many there and elsewhere, the first tipoff that something had hit the nation's capital was not the shockwave, but the massive outpouring on Twitter. “The D.C. earthquake marked a new high watermark, which was 7,500 tweets per ...


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