The open-ended ban on political advertising is especially significant, after Facebook resisted calls to remove the ads for months. Last month, the company had said it only would stop accepting new political ads in the week before Election Day, so existing political ads would continue circulating. New political ads could have resumed running after Election Day.
But Facebook lags other social media companies in banning political ads. Jack Dorsey, Twitter’s chief executive, banned all political ads from the service a year ago because, he said, they could rapidly spread misinformation and had “significant ramifications that today’s democratic infrastructure may not be prepared to handle.” Last month, Google said it, too, would ban all political and issue ads after Election Day.
Mr. Zuckerberg has said that ads give less well-known politicians the ability to promote themselves, and that eliminating those ads could hurt their chances at broadening their support base online.