From the BBC:
Facebook has admitted that it observed attempts to spread propaganda on its site, apparently orchestrated by governments or organised parties.
The firm has seen “false news, disinformation, or networks of fake accounts aimed at manipulating public opinion”, it revealed in a new report.
“Several” such cases during the US presidential election last year required action, it added.
Facebook described much of the activity as “false amplification” – which included the mass creation of fake accounts; the coordinated sharing of content and engagement with that content (such as likes); and the distribution of “inflammatory and sometimes racist memes”.
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The Facebook report cited in the article is available here (13 pages; PDF).