Facebook CEO Mark Zuckerberg defends decision to let politicians lie in ads

Facebook CEO and co-founder Mark Zuckerberg on Thursday defended the social network's decision not to send speech from politicians to third-party fact-checkers, a move that's drawn scrutiny, especially from Democrats in the US.

"I don't think most people want to live in a world where you can only post things that tech companies judge to be 100% true," Zuckerberg said during a nearly 40-minute speech at Georgetown University.

The remarks highlight the social network's controversial approach to political speech as it tries to strike a balance between free speech...