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.