Once Cozy With Silicon Valley, Democrats Grow Wary of Tech Giants - The New York Times

Later in the article: "Fundamentally, the problem is that “disinformation campaigns and legitimate advertising campaigns are effectively indistinguishable on leading internet platforms, ” Mr. Ghosh and Mr. Scott wrote."

"A few months later, Mr. Ghosh quit his job at Facebook, where he worked on privacy and public policy issues. On Tuesday, a Washington think tank, New America, and Harvard’s Berkman Klein Center for Internet and Society published a report he co-wrote, asserting that technology behind digital advertising — the financial lifeblood of Facebook, Google and Twitter — has made disinformation campaigns more effective.

“The problems were much broader than we imagined, and it was not just about one tool or platform,” said Mr. Ghosh, who with his co-author, Ben Scott, worked on devising Mrs. Clinton’s tech policy platform. “It’s the profit model underlying the whole digital advertising system.”"

Once Cozy With Silicon Valley, Democrats Grow Wary of Tech Giants - The New York Times