Almost 75% of US Internet users watched videos online in July, up from 71.4% in March, according to comScore Networks. The monthly time spent watching videos went up to an average of 181 minutes per viewer in July from 145 minutes per viewer in March.

comScore maintains massive proprietary databases that provide a continuous, real-time measurement of the myriad ways in which the Internet is used and the wide variety of activities that are occurring online.

Google Sites topped the July rankings with both the most unique video viewers and most videos viewed.

July saw Americans view more than 9 billion videos online, with Google Sites once again ranking as the top U.S. video property with nearly 2.5 billion videos viewed (27.0 percent share of videos), 2.4 billion of which occurred at YouTube.com. Yahoo! Sites ranked second with 390 million (4.3 percent), followed by Fox Interactive Media with 298 million (3.3 percent) and Viacom Digital with 281 million (3.1 percent).

Other notable findings from July 2007 include:

• Online viewers watched an average of more than three hours of online video during the month (181 minutes).
• The average online video duration was 2.7 minutes.
• Nearly three out of four (74.2 percent) U.S. Internet users viewed video online.
• More than one out of three (36.7 percent) U.S. Internet users viewed video on YouTube.com.
• The average online video viewer consumed 68 videos, or more than two per day.