Facebook has shut down hundreds of fake pages and accounts pushing pro-Donald Trump messages.
The social network says the accounts originated in Vietnam and Georgia, and used artificially-generated faces to pose as Americans.
"We're taking down these pages, groups and accounts based on their behavior, not the content they posted," Facebook's head of security Nathaniel Gleicher wrote in a blog post.
"In each of these cases, the people behind this activity coordinated with one another and used fake accounts to misrepresent themselves, and that was the basis for our action... Each of them created networks of accounts to mislead others about who they were and what they were doing."
The Georgian accounts, linked to the country's pro-Russia governing party Georgian Dream, "posed as news organisations and impersonated political parties, public figures, activist groups and media entities", Facebook said.
While fake accounts from Vietnam "typically posted memes and other content about US political news and issues including impeachment, conservative ideology, political candidates, elections, trade, family values and freedom of religion".
Facebook provided some examples of the content the accounts posted, including attacks on Democrats hoping to beat Trump at next year's US presidential election.
The accounts appeared to be linked to media outlet The BL and Epoch Media Group, a US-based group with ties to Chinese religion Falun Gong, which Facebook said "repeatedly violated a number of our policies, including our policies against coordinated inauthentic behavior, spam and misrepresentation, to name just a few".
The Epoch Media Group operates in New Zealand, publishing The Epoch Times. Fact-checking site Snopes in November said The Epoch Times "has effectively served as an arm of the Donald Trump campaign since 2016".
"The BL is now banned from Facebook," said Gleicher. "We are continuing to investigate all linked networks, and will take action as appropriate if we determine they are engaged in deceptive behaviour."
In all, Facebook shut down around 1350 accounts, pages and groups with 55 million followers between them.
