Lies Damn Lies and Statistics
Ben franklin had it right
this model is based of incomplete evidence and assumed facts.
There is no measure of how many tweets WaPo were not able to verify, no mention of how many were factually correct, and it only used 150 sets of max 280 chars, hardly enough to eet any criteria for a robust test, and the training sample bias needs to be scrutanised, and probably needs to include a much larger sample too.