Facebook has uncovered and removed dozens of pages, accounts and groups linked to Iran that the firm says coordinated “inauthentic behaviour”, targeting people in the US and UK.
The affected posts focused on divisive topics such as race relations, opposition to President Donald Trump and immigration, it said.
The social network revealed that it uncovered the activity a week ago.
“We can’t say for sure who is responsible,” it said in a blog post.
Only two advertisements were connected to the effort.
Unlike a batch of Iranian propaganda Facebook identified in August, these messages appeared more varied, with anti-Israel and anti-Saudi Arabia commentary mixed in
Facebook said had so far found no ties to the Iranian government but that its investigation was ongoing.