On Monday evening, Facebook announced that, thanks to a tip from federal law enforcement, it had removed 30 Facebook accounts and 85 Instagram accounts "that may be engaged in coordinated inauthentic behavior."

Nathaniel Gleicher, the company’s head of cybersecurity policy, wrote in a blog post that these accounts were blocked and that nearly all of the Facebook pages were written in French or Russian, while the Instagram pages were written in English.

"Some were focused on celebrities, others political debate," he wrote, and did not list or further describe them.

"Typically, we would be further along with our analysis before announcing anything publicly. But given that we are only one day away from important elections in the US, we wanted to let people know about the action we’ve taken and the facts as we know them today."

As recently as late October, Facebook pulled dozens of Iran-connected accounts on both social platforms.

Three months earlier, Facebook disclosed that there was a Russian campaign that advertised a faux protest in Washington, DC.

Reuters cited what appeared to be an earlier version of the Facebook post, claiming that the tip came from the FBI itself.

When Ars tried to confirm this with Facebook, the company declined to answer.

"We don’t have information to share beyond the post at this time," Jay Nancarrow, a company spokesman, emailed Ars on Monday evening. He did not refute Reuters' reporting.

Earlier on Monday, numerous federal agencies, including the FBI, wrote a joint statement alerting Americans to the fact that "foreign actors—and Russia in particular—continue to try to influence public sentiment and voter perceptions through actions intended to sow discord."