President Obama's first State of the Union address live webcast, last week, drew 1.3 million viewers in WhiteHouse.gov/live, according to the White House blog.
In addition, "thousands of people" also watched it via de White House iPhone App. A nearly a terabyte of data was served to iPhones.
More numbers. Over 50,000 people joined a Facebook chat with administration officials following the speech.
The White House encourages people to go to YouTube.com/CitizenTube to submit and vote on questions for President Obama.