Bracing for a contentious election with no immediate results and possible "civil unrest," Facebook is enacting a host of measures to ensure its platform is not used to sow chaos and spread misinformation before, during and after the U.S. presidential election. 

But it's not clear if the changes are enough. 

The company said Thursday it will restrict new political ads in the week before the election and remove posts that convey misinformation about COVID-19 and voting. It will also attach links with official results to posts by candidates and campaigns that prematurely declare victory. 

"This election is not going to be business as usual. We all have a responsibility to protect our democracy," Facebook CEO Mark Zuckerberg said in a post on Thursday. "That means helping people register and vote, clearing up confusion about how this election will work, and taking steps to reduce the chances of violence and unrest."

Some activists hailed the new policies but said the onus will be on Facebook to enforce them. And others were skeptical that they'll really make a difference. 

"Voting starts in North Carolina tomorrow. Election Day isn't in two months, it's tomorrow and every day after. Which means voters in that state and many others that vote early will be subject to months of dishonest ads on Facebook's platform," said Shaunna Thomas, co-founder and executive director of UltraViolet, a women's organization critical of Facebook. 

She called the announcement a "PR stunt designed to distract from the fact that Facebook is the single biggest vector of dangerous misinformation and voter suppression campaigns in the United States." 

Siva Vaidhyanathan, a Facebook expert at the University of Virginia, said the company again proved itself incapable of effectively snuffing out dangerous misinformation last week when it failed to remove postings by right-wing militia organizers urging supporters with rifles to converge on Kenosha, Wisconsin. 

"Facebook's biggest problem has always been enforcement," he said. "Even when it creates reasonable policies that seem well-meaning, it gets defeated by its own scale. So I am not optimistic that this will be terribly effective." 

Facebook and other social media companies are being scrutinized over how they handle misinformation, given problems with President Donald Trump and other candidates posting false information. 

Facebook has long been criticized for not fact-checking political ads or limiting how they can be targeted at small groups of people. 

With the nation divided, and election results potentially taking days or weeks to be finalized, there could be an "increased risk of civil unrest across the country," Zuckerberg said. 

Civil rights groups said they directly pitched Zuckerberg and other Facebook executives to make many of the changes announced Thursday. 

"These are really significant steps but everything is going to depend on the enforcement," said Vanita Gupta, who was head of the Obama Justice Department's Civil Rights Division and now leads the Leadership Conference on Civil and Human Rights. "I think they're going to be tested on it pretty soon."