WASHINGTON — The 30-second video ad released by the Trump campaign last week is grainy, and the narrator’s voice is foreboding. Former Vice President Joseph R. Biden Jr., it says, offered Ukraine $1 billion in aid if the country pushed out the man investigating a company tied to Mr. Biden’s son.
Saying it made false accusations, CNN immediately refused to air the advertisement.
But Facebook did not, and on Tuesday, the social network rejected a request from Mr. Biden’s presidential campaign to take it down, foreshadowing a continuing fight over misinformation on the service during the 2020 election as well as the impeachment inquiry into President Trump.
In a letter to the Biden campaign, Facebook said the ad, which has been viewed five million times on the site, did not violate company policies. Last month, the social network, which has more than two billion users, announced that politicians and their campaigns had nearly free rein over content they post there.
Even false statements and misleading content in ads, the company has said, are an important part of the political conversation.
“Our approach is grounded in Facebook’s fundamental belief in free expression, respect for the democratic process, and the belief that, in mature democracies with a free press, political speech is already arguably the most scrutinized speech there is,” Facebook’s head of global elections policy, Katie Harbath, wrote in the letter to the Biden campaign.
The decision by the company illustrates its executives’ hardened resolve to stay out of the moderation of political speech, despite the use of the social network to spread discord and disinformation in the 2016 presidential campaign. On Tuesday, the Republican-led Senate Intelligence Committee released a sobering report warning of fresh signs of interference by Russia and other foreign nations in the 2020 election.