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>With colleagues at the University of Maryland and Johns Hopkins University, Dr. Broniatowski looked at 899 vaccine-related tweets sent from mid-2014 to late 2017.

If there were either hundreds or at least several tens of thousands tweets like that, or if all of the tweets they've screened were highly popular, then I could take that study seriously. As it is, however, this appears to be a targeted evaluation failing to qualify the significance of those tweets' impact.