Which social media campaign was the first to exceed 1 million followers for a government agency?

Social media has transformed how government agencies communicate with citizens. From emergency alerts to policy announcements, government entities increasingly rely on digital platforms to reach the public efficiently. This evolution has created new standards for transparency, accessibility, and public engagement. How well do you know the history of government social media usage?

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NASA's "Year In Space" campaign (2015)
FEMA's "Ready.gov" emergency preparedness initiative (2012)
CDC's "Zombie Preparedness" disaster readiness campaign (2011)
The White House's "We the People" petition platform launch (2013)