comScore today released April 2008 data from its comScore Video Metrix service, revealing that U.S. Internet users viewed 11 billion online videos during the month, with YouTube accounting for more than 4 billion of that total.

Other highlights:

• 71 percent of the total U.S. Internet audience viewed online video.
• The average online video viewer watched 228 minutes of video.
• 18-34 year olds were the heaviest viewing segment, watching an average of 287 minutes per viewer.
• The average online video duration was 2.8 minutes.

Nearly 135 million U.S. Internet users watched an average of 82 videos per viewer in April.

Google Sites attracted the most viewers (83.7 million), where they watched an average of 50 videos per person. Fox Interactive attracted the second most viewers (52 million), followed by Yahoo! Sites (37.3 million) and Microsoft Sites (29.9 million).

More than 4 Billion Videos Viewed at Google Sites

In April, Google Sites once again ranked as the top U.S. video property with more than 4.1 billion videos viewed (38 percent share of all videos), as YouTube.com accounted for 98 percent of all videos viewed at the property. Fox Interactive Media ranked second with 558 million videos (5.1 percent), followed by Yahoo! Sites with 352 million (3.2 percent) and Microsoft Sites with 268 million (2.4 percent).

*Rankings based on video content sites; excludes video server networks.  Online video includes both streaming and progressive download video.