Which digital marketing innovation first achieved over 1 million citizen interactions for a government transparency initiative?

The digital transformation of government communications has evolved dramatically over the past decade. Government agencies worldwide have adopted sophisticated digital marketing strategies to connect with citizens, promote initiatives, and improve public engagement. This trivia tests your knowledge about a groundbreaking digital marketing campaign that changed how governments interact with citizens online. Do you know which innovative approach yielded unprecedented engagement?

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The UK's GDS 'GOV.UK' interactive data visualization dashboards (2012)
Australia's 'mygov' personalized notification system (2013)
The US 'Open Government Partnership' social media campaign (2011)
Estonia's e-Residency digital identity marketing program (2014)