Facebook CEO Mark Zuckerberg testifies before a House Energy and Commerce Committee hearing regarding the company’s use and protection of user data on Capitol Hill in Washington, April 11, 2018.

Facebook will ban false information about voting requirements and fake reports of violence or long lines at polling stations in the run-up to and during next month's U.S. midterm elections, company executives told Reuters, the latest effort to reduce voter manipulation on its service.

The world's largest online social network, with 1.5 billion daily users, has stopped short of banning all false or misleading posts, something that Facebook has shied away from as it would likely increase its expenses and leave it open to charges of censorship.

The latest move addresses a sensitive area for the company, which has come under fire for its lax approach to fake news reports and disinformation campaigns, which many believe affected the outcome of the 2016 presidential election, won by Donald Trump.

The new policy was disclosed by Facebook's cyber security policy chief, Nathaniel Gleicher, and other company executives.

The ban on false information about voting methods, set to be announced later on Monday, comes six weeks after Senator Ron Wyden asked Chief Operating Officer Sheryl Sandberg how Facebook would counter posts aimed at suppressing votes, such as by telling certain users they could vote by text, a hoax that has been used to reduce turnout in the past.

The information on voting methods becomes one of the few areas in which falsehoods are prohibited on Facebook, a policy enforced by what the company calls "community standards" moderators, although application of its standards has been uneven. It will not stop the vast majority of untruthful posts about candidates or other election issues.

"We don't believe we should remove things from Facebook that are shared by authentic people if they don't violate those community standards, even if they are false," said Tessa Lyons, product manager for Facebook's News Feed feature that shows users what friends are sharing.

That leaves Facebook more open to manipulation by users seeking to affect the election. Russia, and potentially other foreign parties, are already making "pervasive" efforts to interfere in upcoming U.S. elections, the leader of Trump's national security team said in early August.

Just days before that, Facebook said it uncovered a coordinated political influence campaign to mislead its users and sow dissension among voters, removing 32 pages and accounts from Facebook and Instagram. Members of Congress briefed by Facebook said the methodology suggested Russian involvement.

Trump has disputed claims that Russia has attempted to interfere in U.S. elections. Russian President Vladimir Putin has denied it.