The Billion-Dollar Disinformation Campaign to Reelect the President

One day last fall, I sat down to create a new Facebook account. I picked a forgettable name, snapped a profile pic with my face obscured, and clicked “Like” on the official pages of Donald Trump and his reelection campaign. Facebook’s algorithm prodded me to follow Ann Coulter, Fox Business, and a variety of fan pages with names like “In Trump We Trust.” I complied. I also gave my cellphone number to the Trump campaign, and joined a handful of private Facebook groups for MAGA diehards, one of which required...