Craig Timberg Karla Adam The Washington Post

Steve Bannon oversaw Cambridge Analytica's early efforts to collect troves of Facebook data, a former employee of the data-science firm said.

The crisis ravaging Facebook started when a young researcher, regretful over his role in turning data on an estimated tens of millions of U.S. voters into a high-tech political persuasion machine, decided to come forward with his story. And he imagined that Facebook, whose user profiles were part of that effort, could be a partner in helping to exh...

Steve Bannon oversaw Cambridge Analytica's early efforts to collect troves of Facebook data, a former employee of the data-science firm said.

The crisis ravaging Facebook started when a young researcher, regretful over his role in turning data on an estimated tens of millions of U.S. voters into a high-tech political persuasion machine, decided to come forward with his story. And he imagined that Facebook, whose user profiles were part of that effort, could be a partner in helping to exh...