The Doppelganger operation is a quintessential case study of a community-driven, open-source investigation, illustrating how media, civil society organisations (CSOs), platforms, and authorities collaboratively counteract foreign influence and misinformation (FIMI) campaigns

Assessing effectiveness: responses to the Doppelganger operation

https://www.disinfo.eu/publications/assessing-cost-effectiveness-responses-to-the-doppelganger-operation/