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The president made more somber remarks after he faced criticism for saying he would send in the National Guard and that "when the looting starts, the shooting starts."
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Researchers culled through more than 200 million tweets discussing the virus since January and found that about 45% were sent by accounts that behave more like computerized robots than humans.
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Many accounts Twitter has suspended or removed have been added to a growing archive of tweets identified as part of "state-backed information operations."