It's not Facebook's job to keep false information off your timeline.

At least that's the perspective of Facebook CEO and founder Mark Zuckerberg, which he shared with shared with The Washington Post ahead of a speech at Georgetown University on Thursday. While Zuckerberg says he's worried about "the erosion of truth" in society, he's just not ready to root out falsehoods on his platform altogether.

Zuckerberg and Facebook have been criticized for letting false news stories and even false claims from politicians stand on the site. That issue was the focus of an experimental ad from Sen. Elizabeth Warren (D-Mass.), in which she claimed Zuckerberg endorsed President Trump for re-election just to see if the site would take it down. Facebook didn't, and on Thursday, Zuckerberg gave a reason why. "I don't think people want to live in a world where you can only say things that tech companies decide are 100 percent true," he said, adding that he fears "potentially cracking down too much" on free expression even if it can lead to confusion.

Still, Zuckerberg acknowledged that the power Facebook has on political systems is very much on his mind. He even considered banning political ads on Facebook altogether, he said Thursday at Georgetown. But that would result in a site that "favors incumbents and whoever the media covers," Zuckerberg added. Read more of Zuckerberg's political thoughts at The Washington Post. Kathryn Krawczyk