The social network giant said the accounts had been removed after USA law enforcement contacted the firm because they believed they were linked to foreign entities.
Gleicher said the investigation began Sunday evening with a tip from US law enforcement, which discovered the suspicious online activity.
Nathaniel Gleicher, the company's head of cybersecurity policy, wrote in a blog post that these accounts were blocked and that almost all of the Facebook pages were written in French or Russian, while the Instagram pages were written in English. The blocked Facebook pages reportedly communicated mainly in French and Russian although the majority of accounts on Instagram were English-speaking. But, since the United States midterms elections are underway, it wanted people to know that it's taking action.
The revelation came less than a month after Facebook unveiled its so-called "war room" dedicated to combating fake accounts and news stories ahead of the midterm elections. Some of the accounts were mostly focused on celebrities and other political debates.
It was the USA law enforcement that warned Facebook about these accounts.
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"Typically, we would be further along with our analysis before announcing anything publicly", Gleicher noted.
"But Americans should be aware that foreign actors - and Russian Federation in particular - continue to try to influence public sentiment and voter perceptions through actions meant to sow discord", it said.
Facebook's former chief security officer Alex Stamos suggested in a tweet that the accounts may be linked to Russia's Internet Research Agency (IRA). "They can do this by spreading false information about political processes and candidates, lying about their own interference activities, disseminating propaganda on social media, and through other tactics".
"It is increasingly clear that major gaps exist in Facebook's efforts, potentially allowing adversaries to exploit your platform with continued disinformation efforts", the senators wrote in a letter Zuckerberg, PC Magazine reported.
On Saturday, Twitter had already confirmed that they deleted accounts, automatic writing of messages to discourage voters to go vote on Tuesday.