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• Executive summary.
• Introduction: Rising IRA involvement in US politics.
• Data & Methodology.
• Overview of IRA activity across platforms.
• RA acticity and key political events in the US.
• The IRA's advertising campaign against US voters.
• How the IRA targeted US audiences on Twitter.
• Engaging US voters with organic posts on Facebook and Instagram.
• Conclusion: IRA activity a political polarization in the US.
• References.
• Series acknowlegements.
• Author biographies.

Russia's Internet Research Agency (IRA) launched an extended attack on the United States by using computational propaganda to misinform and polarize US voters. This report provides the first major analysis of this attack based on data provided by social media firms to the Senate Select Committee on Intelligence (SSCI). This analysis answers several key questions about the activities of the known IRA accounts. In this analysis, we investigate how the IRA exploited the tools and platform of Facebook, Instagram, Twitter and YouTube to impact US users. We identify which aspects of the IRA's campaign strategy got the most traction on social media and the means of microtargeting US voters with particular messages.