Of the most heavily-used sectors, videos/movies was the only other to experience a significant growth in share of US activity online. Its share of activity grew relatively by 12 percent from 3.5 to 3.9 percent. June 2010 was a major milestone for US online video as the number of videos streamed passed the 10 billion mark. The average American consumer streaming online video spent 3 hours 15 minutes doing so during the month.
Nielsen: Americans Spend Nearly a Quarter of Their Online Time on Social Networking Sites