Twitter said on Thursday that countries including Bangladesh and Venezuela had been using social media to disseminate government talking points, while Facebook detailed a broad Iranian disinformation campaign that touched on everything from the conflict in Syria to conspiracy theories about the Sept. 11 attacks.

The campaigns tied to various governments — as well as privately held accounts in the United States — followed a pattern similar to Russian disinformation efforts before and after the 2016 presidential election. Millions of people were targeted by content designed to widen political and social divisions among Americans.
https://www.nytimes.com/2019/01/31/technology/twitter-disinformation-united-states-russia.html