The post-election advertising ban brings the company in line with Google, which last month said it will not publish political ads after polls close. Facebook, which has resisted calls to fact-check political ads, had previously said it would not accept any new political ads in the week before the Nov.
Election watchers and social media companies say they are bracing for the possibility that final results will be delayed because so many people are voting by mail during the pandemic.
That includes President Trump, who has repeatedly made false claims online about mail-in voting and attempted to undermine the legitimacy of the election.
Social media companies have tightened their rules against election misinformation and efforts to dissuade people from voting.
On Wednesday, Facebook also gave more details on its plans to prevent candidates from claiming premature victory or misrepresenting the vote-counting process. Once polls close, it will run a banner with information about the counting process at the top of the Facebook and Instagram apps.
Once a winner has been declared, if another candidate or party contests the results, Facebook will update the notification at the top of its apps with the winner's name and label posts from presidential candidates with the winner.
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