A: Mountain View, California, United States
On February 1, 2010 Steve Grove, Head of News and Politics at YouTube, interviewed President Barack Obama on YouTube's, CitizenTube.com:
"The President responded to your questions in a live YouTube interview at the White House on Monday, February 1st.
"You submitted over 11,000 questions and cast over 667,000 votes after the President's State of the Union address last week. We collected the top questions, ensuring we covered a range of issues, minimized duplicate questions, and included both video and text submissions" (http://www.youtube.com/user/citizentube#p/c/EB843ABAF59735FD, accessed 02-02-2010).
This was the first time that a sitting president was interviewed by social media, rather than broadcast news media.