On the eve of mid-term election, Facebook said Monday that it had blocked 115 social media accounts after receiving a warning from federal law enforcement officials of "coordinated inauthentic behavior" that could be linked to foreign entities.
In a blog post Monday night, Nathaniel Gleicher, Facebook's head of cyber security policy, said 85 of the accounts were on the company's Instagram service, with the remainder on Facebook itself.
Gleicher wrote that the accounts were immediately blocked after the company was notified Sunday evening of suspicious behavior and that the questionable accounts — potentially linked to foreign entities — are being investigated "in more detail."
"[Almost] all the Facebook pages associated with these accounts appear to be in the French or Russian languages, while the Instagram accounts seem to have mostly been in English," he said, adding that some of the accounts were focused on celebrities, with others on politics.
Gleicher said the company typically waits until it is further along in such a probe before publicly acknowledging the steps it takes to remove suspicious accounts, but "given that we are only one day away from important elections in the U.S., we wanted to let people know about the action we've taken and the facts as we know them today."
He also pledged to keep the public updated, suggesting Facebook may move to block more suspicious accounts.
Facebook and other social media companies are sensitive to the potential for misbehavior. They were widely criticized following the 2016 presidential election for allowing themselves to be exploited by foreign influence campaigns.
But as NPR's Tim Mak reported last month, Facebook has taken steps to avoid a repeat of 2016. Tim was among a group of journalists the company invited to tour the "war room" Facebook has established at its headquarters in Menlo Park, California.
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