Facebook said Tuesday it had been unable to determine who was behind dozens of fake accounts it took down shortly before the 2018 U.S. midterm elections.
“Combined with our takedown last Monday, in total we have removed 36 Facebook accounts, 6 Pages, and 99 Instagram accounts for coordinated inauthentic behavior,” Nathaniel Gleicher, head of cybersecurity policy, wrote on the company’s blog.
At least one of the Instagram accounts had well over a million followers, according to Facebook.
A website that said it represented the Russian state-sponsored Internet Research Agency claimed responsibility for the accounts last week, but Facebook said it did not have enough information to connect the agency that has been called a troll farm.
“As multiple independent experts have pointed out, trolls have an incentive to claim that their activities are more widespread and influential than may be the case,” Gleicher wrote.
Sample images provided by Facebook showed posts on a wide range of issues. Some advocated on behalf of social issues such as women’s rights and LGBT pride, while others appeared to be conservative users voicing support for President Donald Trump.
The viewpoints on display potentially fall in line with a Russian tactic identified in other cases of falsified accounts. A recent analysis of millions of tweets by the Atlantic Council found that Russian trolls often pose as members on either side of contentious issues in order to maximize division in the United States.