U.S. Under Secretary of State for Public Diplomacy and Public Affairs Tara D. Sonenshine responds to questions during a Twitter Q & A in nine languages at the Department of State in Washington, D.C. on June 27, 2012. [State Department photo/ Public Domain]

Department of State Spokesperson Toria Nuland responds to a question from @Lacerebra on the situation in Greece during a Twitter Briefing at the Department of State in Washington, D.C. on June 20, 2012. [Go to http://video.state.gov for more video and text transcript.]

Department of State Spokesperson Toria Nuland responds to a question from @ContessaBourbon on U.S. sustainable development initiatives during a Twitter Briefing at the Department of State in Washington, D.C. on June 20, 2012. [Go to http://video.state.gov for more video and text transcript.]