Facebook and Twitter have taken down a network of African-based fake accounts linked to previously banned Russian trolls.
The social-media firms say the accounts, based in Ghana and Nigeria, were aimed at US citizens.
They said although none of the activity focused on elections or political candidates, the network had requested to run political ads there.
Twitter said the accounts attempted to “sow discord”.
An investigation by Facebook, in conjunction with CNN, found some accounts posted as a charity based in Ghana.
The troll factory was run from the headquarters of Ebla (Eliminating Barriers for the Liberation of Africa), near Accra, according to the investigators.
Others posed as blogs or posted in Facebook groups. All of the fake accounts focused on topics such as black history, fashion, celebrity gossip, US news and LGBTQ issues.