One-third of all Internet videos watched in the US were on YouTube, according to the latest research from comScore.

January 2008 data shows that YouTube.com accounted for one-third of the 9.8 billion videos viewed online in the U.S. during the month. The total number of videos viewed in January was down slightly from the more than 10.1 billion viewed during a record-breaking December 2007.

Top Five Internet Video Sites:

• Google Sites – 34.3% share of videos viewed. (YouTube.com accounted for more than 96 percent of all videos viewed at Google Sites.)
• Fox Interactive¬† – 6%
• Yahoo! Sites – 3.2%
• Microsoft Sites – 2%
• Viacom – 2%

Other notable findings from January 2008 include:

• More than three-quarters of the total U.S. Internet audience (75.7 percent) viewed online video.
• 78.5 million viewers watched 3.25 billion videos on YouTube.com (41.4 videos per viewer).
• 49.4 million viewers watched 534¬† million videos on MySpace.com (10.8 videos per viewer).
• The average online video duration was 2.9 minutes.
• The average online video viewer consumed 70 videos.