How China built a covert Twitter propaganda machine — then let it loose on coronavirus

How China built a covert Twitter propaganda machine — then let it loose on coronavirus: ProPublica is a Pulitzer Prize-winning investigative newsroom. Sign up for The Big Story newsletter to receive stories like this one in your inbox.


Kalen Keegan, a college student at the University of Nebraska Omaha, immediately noticed when her Twitter account unleashed a torrent of posts in C