Which U.S. government agency launched the first official, coordinated social media campaign to engage citizens?

Government agencies have evolved their public engagement strategies dramatically in the digital age. Before digital town halls, virtual public forums, and constant Twitter updates became the norm, there was a watershed moment when government entities first embraced social media as a formal marketing channel. This poll tests your knowledge of this significant product marketing milestone in the politics and government sector.

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NASA with its 2008 Phoenix Mars Lander mission, which used Twitter to provide real-time mission updates and 'speak' as the spacecraft
The White House during Obama's 2009 transition, with its 'Open for Questions' initiative on various platforms
The CDC's 2009 H1N1 flu outbreak response, which used Facebook and Twitter to distribute critical public health information
FEMA's social media emergency response system launched after Hurricane Katrina in 2006