Enlarge / The Facebook app displayed on the screen of an iPhone. (credit: Fabian Sommer | picture alliance | Getty Images )

After being implicated in massive voter-interference campaigns in 2016, Facebook promised this time would be better. The company changed its policies and swore up and down that it would work hard to mitigate the spread of misinformation and support Americans' rights to get out and vote this fall. But with five weeks to go before Election Day—and early voting already underway in some states—critics allege Facebook is not keeping up with the challenge.

The latest person to accuse Facebook of failing to manage misinformation is the Democratic candidate for president, former Vice President Joe Biden. The Biden campaign said in a letter to Facebook ( PDF ) last night that the company is not only failing to take long-promised additional actions, but is in fact regressing in how well it handles falsehoods.

"Facebook's continued promise of future action is serving as nothing more than an excuse for inaction," Biden campaign manager Jen O'Malley Dillon wrote. "Millions of people are voting. Meanwhile, your platform is the nation's foremost propagator of disinformation about the voting process."